description: Let's call the string beautiful if it does not contain a substring of length at least 2, which is a palindrome. Recall that a palindrome is a string that reads the same way from the first character to the last and from the last character to the first. For example, the strings a, bab, acca, bcabcbacb are palindromes, but the strings ab, abbbaa, cccb are not.
  
  Let's define cost of a string as the minimum number of operations so that the string becomes beautiful, if in one operation it is allowed to change any character of the string to one of the first 3 letters of the Latin alphabet (in lowercase).
  
  You are given a string s of length n, each character of the string is one of the first 3 letters of the Latin alphabet (in lowercase).
  
  You have to answer m queries — calculate the cost of the substring of the string s from l_i-th to r_i-th position, inclusive.
  
  Input
  
  The first line contains two integers n and m (1 ≤ n, m ≤ 2 ⋅ 10^5) — the length of the string s and the number of queries.
  
  The second line contains the string s, it consists of n characters, each character one of the first 3 Latin letters.
  
  The following m lines contain two integers l_i and r_i (1 ≤ l_i ≤ r_i ≤ n) — parameters of the i-th query.
  
  Output
  
  For each query, print a single integer — the cost of the substring of the string s from l_i-th to r_i-th position, inclusive.
  
  Example
  
  Input
  
  
  5 4
  baacb
  1 3
  1 5
  4 5
  2 3
  
  
  Output
  
  
  1
  2
  0
  1
  
  Note
  
  Consider the queries of the example test.
  
    * in the first query, the substring is baa, which can be changed to bac in one operation; 
    * in the second query, the substring is baacb, which can be changed to cbacb in two operations; 
    * in the third query, the substring is cb, which can be left unchanged; 
    * in the fourth query, the substring is aa, which can be changed to ba in one operation. 
solution: import static java.lang.Math.max;
  import static java.lang.Math.min;
  import static java.lang.Math.abs;
  import java.util.*;
  import java.io.*;
  import java.math.*;
  
  /**
   *
   * @Har_Har_Mahadev
   */
  
  /**
   * Main , Solution , Remove Public
   */
  public class D {
  
  	public static void process() throws IOException {
  
  		int n = sc.nextInt(),m = sc.nextInt();
  		String str = sc.next();
  		long dp[][] = new long[n][3];
  		long a = 0,b = 0,c = 0;
  		for(int i = 0; i<n; i+=3) {
  			if(str.charAt(i) == 'a')a++;
  			if(str.charAt(i) == 'b')b++;
  			if(str.charAt(i) == 'c')c++;
  			dp[i][0] = a;
  			dp[i][1] = b;
  			dp[i][2] = c;
  		}
  		a = 0;b = 0;c = 0;
  		for(int i = 1; i<n; i+=3) {
  			if(str.charAt(i) == 'a')a++;
  			if(str.charAt(i) == 'b')b++;
  			if(str.charAt(i) == 'c')c++;
  			dp[i][0] = a;
  			dp[i][1] = b;
  			dp[i][2] = c;
  		}
  		a = 0;b = 0;c = 0;
  		for(int i = 2; i<n; i+=3) {
  			if(str.charAt(i) == 'a')a++;
  			if(str.charAt(i) == 'b')b++;
  			if(str.charAt(i) == 'c')c++;
  			dp[i][0] = a;
  			dp[i][1] = b;
  			dp[i][2] = c;
  		}
  		while(m-- > 0) {
  			int l = sc.nextInt()-1,r = sc.nextInt()-1;
  			long min = INF;
  			for(int i = 0; i<3; i++) {
  				for(int j = 0; j<3; j++) {
  					for(int k = 0; k<3; k++) {
  						if(i == j || j == k || i == k)continue;
  						long mm[][] = new long[3][3];
  						for(int x = 0; x<3; x++) {
  							Arrays.fill(mm[x], 0);
  						}
  						int index = l-1;
  						int cc = 3;
  						while(index>=0 && cc > 0) {
  							mm[index%3] = dp[index];
  							index--;
  							cc--;
  						}
  						long len = r-l+1;
  						long ans = 0;
  						long val = dp[r][i] - mm[r%3][i];
  						ans+=val;
  						
  						if(r-1>=l) {
  							val = dp[r-1][j] - mm[(r-1)%3][j];
  							ans+=val;
  						}
  						if(r-2>=l) {
  							val = dp[r-2][k] - mm[(r-2)%3][k];
  							ans+=val;
  						}
  						ans = len-ans;
  						min = min(min,ans);
  						
  					}
  				}
  			}
  			out.println(min);
  		}
  
  	}
  
  	//=============================================================================
  	//--------------------------The End---------------------------------
  	//=============================================================================
  	private static long INF = 2000000000000000000L, M = 1000000007, MM = 998244353;
  	private static int N = 0;
  
  	private static void google(int tt) {
  		System.out.print("Case #" + (tt) + ": ");
  	}
  
  	static FastScanner sc;
  	static FastWriter out;
  
  	public static void main(String[] args) throws IOException {
  		boolean oj = true;
  		if (oj) {
  			sc = new FastScanner();
  			out = new FastWriter(System.out);
  		} else {
  			sc = new FastScanner("input.txt");
  			out = new FastWriter("output.txt");
  		}
  		long s = System.currentTimeMillis();
  		int t = 1;
  //		t = sc.nextInt();
  		int TTT = 1;
  		while (t-- > 0) {
  			//			google(TTT++);
  			process();
  		}
  		out.flush();
  		//		tr(System.currentTimeMillis()-s+"ms");
  	}
  
  	private static boolean oj = System.getProperty("ONLINE_JUDGE") != null;
  
  	private static void tr(Object... o) {
  		if (!oj)
  			System.err.println(Arrays.deepToString(o));
  	}
  
  	static class Pair implements Comparable<Pair> {
  		int x, y;
  
  		Pair(int x, int y) {
  			this.x = x;
  			this.y = y;
  		}
  
  		@Override
  		public int compareTo(Pair o) {
  			return Integer.compare(this.x, o.x);
  		}
  
  		/*
  		 	@Override
  		    public boolean equals(Object o) {
  		        if (this == o) return true;
  		        if (!(o instanceof Pair)) return false;
  		        Pair key = (Pair) o;
  		        return x == key.x && y == key.y;
  		    }
  		 
  		    @Override
  		    public int hashCode() {
  		        int result = x;
  		        result = 31 * result + y;
  		        return result;
  		    }
  		*/
  	}
  
  	/////////////////////////////////////////////////////////////////////////////////////////////////////////
  
  	static int ceil(int x, int y) {
  		return (x % y == 0 ? x / y : (x / y + 1));
  	}
  
  	static long ceil(long x, long y) {
  		return (x % y == 0 ? x / y : (x / y + 1));
  	}
  
  	static long sqrt(long z) {
  		long sqz = (long) Math.sqrt(z);
  		while (sqz * 1L * sqz < z) {
  			sqz++;
  		}
  		while (sqz * 1L * sqz > z) {
  			sqz--;
  		}
  		return sqz;
  	}
  
  	static int log2(int N) {
  		int result = (int) (Math.log(N) / Math.log(2));
  		return result;
  	}
  
  	public static long gcd(long a, long b) {
  		if (a > b)
  			a = (a + b) - (b = a);
  		if (a == 0L)
  			return b;
  		return gcd(b % a, a);
  	}
  
  	public static long lcm(long a, long b) {
  		return (a * b) / gcd(a, b);
  	}
  
  	public static int lower_bound(int[] arr, int x) {
  		int low = 0, high = arr.length - 1, mid = -1;
  		int ans = -1;
  		while (low <= high) {
  			mid = (low + high) / 2;
  
  			if (arr[mid] > x) {
  				high = mid - 1;
  			} else {
  				ans = mid;
  				low = mid + 1;
  			}
  		}
  
  		return ans;
  	}
  
  	public static int upper_bound(int[] arr, int x) {
  		int low = 0, high = arr.length - 1, mid = -1;
  		int ans = arr.length;
  		while (low < high) {
  			mid = (low + high) / 2;
  
  			if (arr[mid] >= x) {
  				ans = mid;
  				high = mid - 1;
  			} else {
  				low = mid + 1;
  			}
  		}
  
  		return ans;
  	}
  
  	static void ruffleSort(int[] a) {
  		Random get = new Random();
  		for (int i = 0; i < a.length; i++) {
  			int r = get.nextInt(a.length);
  			int temp = a[i];
  			a[i] = a[r];
  			a[r] = temp;
  		}
  		Arrays.sort(a);
  	}
  
  	static void ruffleSort(long[] a) {
  		Random get = new Random();
  		for (int i = 0; i < a.length; i++) {
  			int r = get.nextInt(a.length);
  			long temp = a[i];
  			a[i] = a[r];
  			a[r] = temp;
  		}
  		Arrays.sort(a);
  	}
  
  	static void reverseArray(int[] a) {
  		int n = a.length;
  		int arr[] = new int[n];
  		for (int i = 0; i < n; i++)
  			arr[i] = a[n - i - 1];
  		for (int i = 0; i < n; i++)
  			a[i] = arr[i];
  	}
  
  	static void reverseArray(long[] a) {
  		int n = a.length;
  		long arr[] = new long[n];
  		for (int i = 0; i < n; i++)
  			arr[i] = a[n - i - 1];
  		for (int i = 0; i < n; i++)
  			a[i] = arr[i];
  	}
  
  	//custom multiset (replace with HashMap if needed)
  	public static void push(TreeMap<Integer, Integer> map, int k, int v) {
  		//map[k] += v;
  		if (!map.containsKey(k))
  			map.put(k, v);
  		else
  			map.put(k, map.get(k) + v);
  	}
  
  	public static void pull(TreeMap<Integer, Integer> map, int k, int v) {
  		//assumes map[k] >= v
  		//map[k] -= v
  		int lol = map.get(k);
  		if (lol == v)
  			map.remove(k);
  		else
  			map.put(k, lol - v);
  	}
  
  	// compress Big value to Time Limit
  	public static int[] compress(int[] arr) {
  		ArrayList<Integer> ls = new ArrayList<Integer>();
  		for (int x : arr)
  			ls.add(x);
  		Collections.sort(ls);
  		HashMap<Integer, Integer> map = new HashMap<Integer, Integer>();
  		int boof = 1; //min value
  		for (int x : ls)
  			if (!map.containsKey(x))
  				map.put(x, boof++);
  		int[] brr = new int[arr.length];
  		for (int i = 0; i < arr.length; i++)
  			brr[i] = map.get(arr[i]);
  		return brr;
  	}
  
  	// Fast Writer 
  
  	public static class FastWriter {
  		private static final int BUF_SIZE = 1 << 13;
  		private final byte[] buf = new byte[BUF_SIZE];
  		private final OutputStream out;
  		private int ptr = 0;
  
  		private FastWriter() {
  			out = null;
  		}
  
  		public FastWriter(OutputStream os) {
  			this.out = os;
  		}
  
  		public FastWriter(String path) {
  			try {
  				this.out = new FileOutputStream(path);
  			} catch (FileNotFoundException e) {
  				throw new RuntimeException("FastWriter");
  			}
  		}
  
  		public FastWriter write(byte b) {
  			buf[ptr++] = b;
  			if (ptr == BUF_SIZE)
  				innerflush();
  			return this;
  		}
  
  		public FastWriter write(char c) {
  			return write((byte) c);
  		}
  
  		public FastWriter write(char[] s) {
  			for (char c : s) {
  				buf[ptr++] = (byte) c;
  				if (ptr == BUF_SIZE)
  					innerflush();
  			}
  			return this;
  		}
  
  		public FastWriter write(String s) {
  			s.chars().forEach(c -> {
  				buf[ptr++] = (byte) c;
  				if (ptr == BUF_SIZE)
  					innerflush();
  			});
  			return this;
  		}
  
  		private static int countDigits(int l) {
  			if (l >= 1000000000)
  				return 10;
  			if (l >= 100000000)
  				return 9;
  			if (l >= 10000000)
  				return 8;
  			if (l >= 1000000)
  				return 7;
  			if (l >= 100000)
  				return 6;
  			if (l >= 10000)
  				return 5;
  			if (l >= 1000)
  				return 4;
  			if (l >= 100)
  				return 3;
  			if (l >= 10)
  				return 2;
  			return 1;
  		}
  
  		public FastWriter write(int x) {
  			if (x == Integer.MIN_VALUE) {
  				return write((long) x);
  			}
  			if (ptr + 12 >= BUF_SIZE)
  				innerflush();
  			if (x < 0) {
  				write((byte) '-');
  				x = -x;
  			}
  			int d = countDigits(x);
  			for (int i = ptr + d - 1; i >= ptr; i--) {
  				buf[i] = (byte) ('0' + x % 10);
  				x /= 10;
  			}
  			ptr += d;
  			return this;
  		}
  
  		private static int countDigits(long l) {
  			if (l >= 1000000000000000000L)
  				return 19;
  			if (l >= 100000000000000000L)
  				return 18;
  			if (l >= 10000000000000000L)
  				return 17;
  			if (l >= 1000000000000000L)
  				return 16;
  			if (l >= 100000000000000L)
  				return 15;
  			if (l >= 10000000000000L)
  				return 14;
  			if (l >= 1000000000000L)
  				return 13;
  			if (l >= 100000000000L)
  				return 12;
  			if (l >= 10000000000L)
  				return 11;
  			if (l >= 1000000000L)
  				return 10;
  			if (l >= 100000000L)
  				return 9;
  			if (l >= 10000000L)
  				return 8;
  			if (l >= 1000000L)
  				return 7;
  			if (l >= 100000L)
  				return 6;
  			if (l >= 10000L)
  				return 5;
  			if (l >= 1000L)
  				return 4;
  			if (l >= 100L)
  				return 3;
  			if (l >= 10L)
  				return 2;
  			return 1;
  		}
  
  		public FastWriter write(long x) {
  			if (x == Long.MIN_VALUE) {
  				return write("" + x);
  			}
  			if (ptr + 21 >= BUF_SIZE)
  				innerflush();
  			if (x < 0) {
  				write((byte) '-');
  				x = -x;
  			}
  			int d = countDigits(x);
  			for (int i = ptr + d - 1; i >= ptr; i--) {
  				buf[i] = (byte) ('0' + x % 10);
  				x /= 10;
  			}
  			ptr += d;
  			return this;
  		}
  
  		public FastWriter write(double x, int precision) {
  			if (x < 0) {
  				write('-');
  				x = -x;
  			}
  			x += Math.pow(10, -precision) / 2;
  			//		if(x < 0){ x = 0; }
  			write((long) x).write(".");
  			x -= (long) x;
  			for (int i = 0; i < precision; i++) {
  				x *= 10;
  				write((char) ('0' + (int) x));
  				x -= (int) x;
  			}
  			return this;
  		}
  
  		public FastWriter writeln(char c) {
  			return write(c).writeln();
  		}
  
  		public FastWriter writeln(int x) {
  			return write(x).writeln();
  		}
  
  		public FastWriter writeln(long x) {
  			return write(x).writeln();
  		}
  
  		public FastWriter writeln(double x, int precision) {
  			return write(x, precision).writeln();
  		}
  
  		public FastWriter write(int... xs) {
  			boolean first = true;
  			for (int x : xs) {
  				if (!first)
  					write(' ');
  				first = false;
  				write(x);
  			}
  			return this;
  		}
  
  		public FastWriter write(long... xs) {
  			boolean first = true;
  			for (long x : xs) {
  				if (!first)
  					write(' ');
  				first = false;
  				write(x);
  			}
  			return this;
  		}
  
  		public FastWriter writeln() {
  			return write((byte) '\n');
  		}
  
  		public FastWriter writeln(int... xs) {
  			return write(xs).writeln();
  		}
  
  		public FastWriter writeln(long... xs) {
  			return write(xs).writeln();
  		}
  
  		public FastWriter writeln(char[] line) {
  			return write(line).writeln();
  		}
  
  		public FastWriter writeln(char[]... map) {
  			for (char[] line : map)
  				write(line).writeln();
  			return this;
  		}
  
  		public FastWriter writeln(String s) {
  			return write(s).writeln();
  		}
  
  		private void innerflush() {
  			try {
  				out.write(buf, 0, ptr);
  				ptr = 0;
  			} catch (IOException e) {
  				throw new RuntimeException("innerflush");
  			}
  		}
  
  		public void flush() {
  			innerflush();
  			try {
  				out.flush();
  			} catch (IOException e) {
  				throw new RuntimeException("flush");
  			}
  		}
  
  		public FastWriter print(byte b) {
  			return write(b);
  		}
  
  		public FastWriter print(char c) {
  			return write(c);
  		}
  
  		public FastWriter print(char[] s) {
  			return write(s);
  		}
  
  		public FastWriter print(String s) {
  			return write(s);
  		}
  
  		public FastWriter print(int x) {
  			return write(x);
  		}
  
  		public FastWriter print(long x) {
  			return write(x);
  		}
  
  		public FastWriter print(double x, int precision) {
  			return write(x, precision);
  		}
  
  		public FastWriter println(char c) {
  			return writeln(c);
  		}
  
  		public FastWriter println(int x) {
  			return writeln(x);
  		}
  
  		public FastWriter println(long x) {
  			return writeln(x);
  		}
  
  		public FastWriter println(double x, int precision) {
  			return writeln(x, precision);
  		}
  
  		public FastWriter print(int... xs) {
  			return write(xs);
  		}
  
  		public FastWriter print(long... xs) {
  			return write(xs);
  		}
  
  		public FastWriter println(int... xs) {
  			return writeln(xs);
  		}
  
  		public FastWriter println(long... xs) {
  			return writeln(xs);
  		}
  
  		public FastWriter println(char[] line) {
  			return writeln(line);
  		}
  
  		public FastWriter println(char[]... map) {
  			return writeln(map);
  		}
  
  		public FastWriter println(String s) {
  			return writeln(s);
  		}
  
  		public FastWriter println() {
  			return writeln();
  		}
  	}
  
  	// Fast Inputs
  	static class FastScanner {
  		//I don't understand how this works lmao
  		private int BS = 1 << 16;
  		private char NC = (char) 0;
  		private byte[] buf = new byte[BS];
  		private int bId = 0, size = 0;
  		private char c = NC;
  		private double cnt = 1;
  		private BufferedInputStream in;
  
  		public FastScanner() {
  			in = new BufferedInputStream(System.in, BS);
  		}
  
  		public FastScanner(String s) {
  			try {
  				in = new BufferedInputStream(new FileInputStream(new File(s)), BS);
  			} catch (Exception e) {
  				in = new BufferedInputStream(System.in, BS);
  			}
  		}
  
  		private char getChar() {
  			while (bId == size) {
  				try {
  					size = in.read(buf);
  				} catch (Exception e) {
  					return NC;
  				}
  				if (size == -1)
  					return NC;
  				bId = 0;
  			}
  			return (char) buf[bId++];
  		}
  
  		public int nextInt() {
  			return (int) nextLong();
  		}
  
  		public int[] readArray(int N) {
  			int[] res = new int[N];
  			for (int i = 0; i < N; i++) {
  				res[i] = (int) nextLong();
  			}
  			return res;
  		}
  
  		public long[] readArrayLong(int N) {
  			long[] res = new long[N];
  			for (int i = 0; i < N; i++) {
  				res[i] = nextLong();
  			}
  			return res;
  		}
  
  		public int[][] readArrayMatrix(int N, int M, int Index) {
  			if (Index == 0) {
  				int[][] res = new int[N][M];
  				for (int i = 0; i < N; i++) {
  					for (int j = 0; j < M; j++)
  						res[i][j] = (int) nextLong();
  				}
  				return res;
  			}
  			int[][] res = new int[N][M];
  			for (int i = 1; i <= N; i++) {
  				for (int j = 1; j <= M; j++)
  					res[i][j] = (int) nextLong();
  			}
  			return res;
  
  		}
  
  		public long[][] readArrayMatrixLong(int N, int M, int Index) {
  			if (Index == 0) {
  				long[][] res = new long[N][M];
  				for (int i = 0; i < N; i++) {
  					for (int j = 0; j < M; j++)
  						res[i][j] = nextLong();
  				}
  				return res;
  			}
  			long[][] res = new long[N][M];
  			for (int i = 1; i <= N; i++) {
  				for (int j = 1; j <= M; j++)
  					res[i][j] = nextLong();
  			}
  			return res;
  
  		}
  
  		public long nextLong() {
  			cnt = 1;
  			boolean neg = false;
  			if (c == NC)
  				c = getChar();
  			for (; (c < '0' || c > '9'); c = getChar()) {
  				if (c == '-')
  					neg = true;
  			}
  			long res = 0;
  			for (; c >= '0' && c <= '9'; c = getChar()) {
  				res = (res << 3) + (res << 1) + c - '0';
  				cnt *= 10;
  			}
  			return neg ? -res : res;
  		}
  
  		public double nextDouble() {
  			double cur = nextLong();
  			return c != '.' ? cur : cur + nextLong() / cnt;
  		}
  
  		public double[] readArrayDouble(int N) {
  			double[] res = new double[N];
  			for (int i = 0; i < N; i++) {
  				res[i] = nextDouble();
  			}
  			return res;
  		}
  
  		public String next() {
  			StringBuilder res = new StringBuilder();
  			while (c <= 32)
  				c = getChar();
  			while (c > 32) {
  				res.append(c);
  				c = getChar();
  			}
  			return res.toString();
  		}
  
  		public String nextLine() {
  			StringBuilder res = new StringBuilder();
  			while (c <= 32)
  				c = getChar();
  			while (c != '\n') {
  				res.append(c);
  				c = getChar();
  			}
  			return res.toString();
  		}
  
  		public boolean hasNext() {
  			if (c > 32)
  				return true;
  			while (true) {
  				c = getChar();
  				if (c == NC)
  					return false;
  				else if (c > 32)
  					return true;
  			}
  		}
  	}
  
  }
  