description: You are given a string s, consisting of n letters, each letter is either 'a' or 'b'. The letters in the string are numbered from 1 to n.
  
  s[l; r] is a continuous substring of letters from index l to r of the string inclusive. 
  
  A string is called balanced if the number of letters 'a' in it is equal to the number of letters 'b'. For example, strings "baba" and "aabbab" are balanced and strings "aaab" and "b" are not.
  
  Find any non-empty balanced substring s[l; r] of string s. Print its l and r (1 ≤ l ≤ r ≤ n). If there is no such substring, then print -1 -1.
  
  Input
  
  The first line contains a single integer t (1 ≤ t ≤ 1000) — the number of testcases.
  
  Then the descriptions of t testcases follow.
  
  The first line of the testcase contains a single integer n (1 ≤ n ≤ 50) — the length of the string.
  
  The second line of the testcase contains a string s, consisting of n letters, each letter is either 'a' or 'b'.
  
  Output
  
  For each testcase print two integers. If there exists a non-empty balanced substring s[l; r], then print l r (1 ≤ l ≤ r ≤ n). Otherwise, print -1 -1.
  
  Example
  
  Input
  
  
  4
  1
  a
  6
  abbaba
  6
  abbaba
  9
  babbabbaa
  
  
  Output
  
  
  -1 -1
  1 6
  3 6
  2 5
  
  Note
  
  In the first testcase there are no non-empty balanced subtrings.
  
  In the second and third testcases there are multiple balanced substrings, including the entire string "abbaba" and substring "baba".
solution: /*
      Author : Akshat Jindal
      from NIT Jalandhar , Punjab , India
      JAI MATA DI
   */
  import java.util.*;
  
  import java.io.*;
  import java.math.*;
  import java.sql.Array;
  
  
  
  public class Main {
  	  static class FR{
  		  
  			BufferedReader br;
  			StringTokenizer st;
  			public FR() {
  				br = new BufferedReader(new InputStreamReader(System.in));
  			}
  			String next() 
  		    { 
  		        while (st == null || !st.hasMoreElements()) 
  		        { 
  		            try
  		            { 
  		                st = new StringTokenizer(br.readLine()); 
  		            } 
  		            catch (IOException  e) 
  		            { 
  		                e.printStackTrace(); 
  		            } 
  		        } 
  		        return st.nextToken(); 
  		    } 
  
  		    int nextInt() 
  		    { 
  		        return Integer.parseInt(next()); 
  		    } 
  
  		    long nextLong() 
  		    { 
  		        return Long.parseLong(next()); 
  		    } 
  
  		    double nextDouble() 
  		    { 
  		        return Double.parseDouble(next()); 
  		    } 
  
  		    String nextLine() 
  		    { 
  		        String str = ""; 
  		        try
  		        { 
  		            str = br.readLine(); 
  		        } 
  		        catch (IOException e) 
  		        { 
  		            e.printStackTrace(); 
  		        } 
  		        return str; 
  		    } 
  		}
  	 
  	  static long mod = (long)(1e9 + 7);
  	 
  	static void sort(long[] arr ) {
  		 ArrayList<Long> al = new ArrayList<>();
  		 for(long e:arr) al.add(e);
  		 Collections.sort(al);
  		 for(int i = 0 ; i<al.size(); i++) arr[i] = al.get(i);
  	 }
  	static void sort(int[] arr ) {
  		 ArrayList<Integer> al = new ArrayList<>();
  		 for(int e:arr) al.add(e);
  		 Collections.sort(al);
  		 for(int i = 0 ; i<al.size(); i++) arr[i] = al.get(i);
  	 }
  	static int UB(long[] arr , long find , int l , int r) {
  		while(l<=r) {
  			int m = (l+r)/2;
  			if(arr[m]<find) l = m+1;
  			else r = m-1;
  		}
  		return l;
  	}
  	static int LB(long[] arr , long find,int l ,int r ) {
  		while(l<=r) {
  			int m = (l+r)/2;
  			if(arr[m] > find) r = m-1;
  			else l = m+1;
  		}
  		return r;
  	}
  	static int UB(int[] arr , long find , int l , int r) {
  		while(l<=r) {
  			int m = (l+r)/2;
  			if(arr[m]<find) l = m+1;
  			else r = m-1;
  		}
  		return l;
  	}
  	static int LB(int[] arr , long find,int l ,int r ) {
  		while(l<=r) {
  			int m = (l+r)/2;
  			if(arr[m] > find) r = m-1;
  			else l = m+1;
  		}
  		return r;
  	}
  	 static long gcd(long a, long b)
  	  {      
  	     if (b == 0)
  	        return a;
  	     return gcd(b, a % b); 
  	  }
  	 static boolean[] prime(int num) {
  			boolean[] bool = new boolean[num];
  		     
  		      for (int i = 0; i< bool.length; i++) {
  		         bool[i] = true;
  		      }
  		      for (int i = 2; i< Math.sqrt(num); i++) {
  		         if(bool[i] == true) {
  		            for(int j = (i*i); j<num; j = j+i) {
  		               bool[j] = false;
  		            }
  		         }
  		      }
  		      if(num >= 0) {
  		    	  bool[0] = false;
  		    	  bool[1] = false;
  		      }
  		      
  		      return bool;
  		}
  	 static void sort(char[] arr) {
  		 ArrayList<Character> al = new ArrayList<Character>();
  		 for(char cc:arr) al.add(cc);
  		 Collections.sort(al);
  		 for(int i = 0 ;i<arr.length ;i++) arr[i] = al.get(i);
  		 
  	 }
  	 static long[][] ncr(int n, int k)
  	    {
  	        long C[][] = new long[n + 1][k + 1];
  	        int i, j;
  	 
  	        // Calculate  value of Binomial
  	        // Coefficient in bottom up manner
  	        for (i = 0; i <= n; i++) {
  	            for (j = 0; j <= Math.min(i, k); j++) {
  	                // Base Cases
  	                if (j == 0 || j == i)
  	                    C[i][j] = 1;
  	 
  	                // Calculate value using
  	                // previously stored values
  	                else
  	                    C[i][j] = (C[i - 1][j - 1] + C[i - 1][j])%mod;
  	            }
  	        }
  	 
  	        return C;
  	    }
  	 static long modInverse(long a, long m)
  	    {
  	        long g = gcd(a, m);
  	       
  	          return   power(a, m - 2, m);
  	        
  	    }
  	   
  	      static long power(long x, long y, long m)
  	    {
  	        if (y == 0)
  	            return 1;
  	        long p = power(x, y / 2, m) % m;
  	        p = (int)((p * (long)p) % m);
  	        if (y % 2 == 0)
  	            return p;
  	        else
  	            return (int)((x * (long)p) % m);
  	    }
  	      static class DisjointUnionSets {
  			    int[] rank, parent;
  			    int n;
  			  
  			    public DisjointUnionSets(int n)
  			    {
  			        rank = new int[n];
  			        parent = new int[n];
  			        this.n = n;
  			        makeSet();
  			    }
  			  
  			    void makeSet()
  			    {
  			        for (int i = 0; i < n; i++) {
  			          
  			            parent[i] = i;
  			        }
  			    }
  			  
  			    int find(int x)
  			    {
  			        if (parent[x] != x) {
  			        
  			            parent[x] = find(parent[x]);
  			  
  			        }
  			  
  			        return parent[x];
  			    }
  			  
  			    void union(int x, int y)
  			    {
  			        int xRoot = find(x), yRoot = find(y);
  			  
  			        if (xRoot == yRoot)
  			            return;
  			  
  			        if (rank[xRoot] < rank[yRoot])
  			  
  			            parent[xRoot] = yRoot;
  			  
  			        else if (rank[yRoot] < rank[xRoot])
  			  
  			            parent[yRoot] = xRoot;
  			  
  			        else
  			        {
  			            parent[yRoot] = xRoot;
  			  
  			            rank[xRoot] = rank[xRoot] + 1;
  			        }
  			    }
  			}
  	      
  /************************************************ Query **************************************************************************************/	  
  	      static class SparseTable{
  	    		
  	    		private long[][] st;
  	    		
  	    		SparseTable(long[] arr){
  	    			int n = arr.length;
  	    			st = new long[n][25];
  	    			log = new int[n+2];
  	    			build_log(n+1);
  	    			build(arr);
  	    		}
  	    		
  	    		private void build(long[] arr) {
  	    			int n = arr.length;
  	    			
  	    			for(int i = n-1 ; i>=0 ; i--) {
  	    				for(int j = 0 ; j<25 ; j++) {
  	    					int r = i + (1<<j)-1;
  	    					if(r>=n) break;
  	    					if(j == 0 ) st[i][j] = arr[i];
  	    					else st[i][j] = Math.min(st[i][j-1] , st[ i + ( 1 << (j-1) ) ][ j-1 ] );
  	    				}
  	    			}
  	    		}
  	    		public long gcd(long a  ,long b) {
  	    			if(a == 0) return b;
  	    			return gcd(b%a , a);
  	    		}
  	    		public long query(int l ,int r) {
  	    			int w = r-l+1;
  	    			int power = log[w];
  	    			return Math.min(st[l][power],st[r - (1<<power) + 1][power]);
  	    		}
  	    		private int[] log;
  	    		void build_log(int n) {
  	    			log[1] = 0;
  	    			for(int i = 2 ; i<=n ; i++) {
  	    				log[i] = 1 + log[i/2];
  	    			}
  	    		}
  	    	}
  //	  	static int query(int[] tree , int ss ,int se ,int qs , int qe,int index) {
  //			
  //			if(ss>=qs && se<=qe) return tree[index];
  //			
  //			if(qe<ss || se<qs) return Integer.MAX_VALUE;
  //			
  //			int mid = (ss + se)/2;
  //			int left = query(tree , ss , mid , qs ,qe , 2*index);
  //			int right= query(tree ,mid + 1 , se , qs ,qe , 2*index+1);
  //			return Math.min(left, right);
  //		}
  //		static void buildTree(int[] a ,int s ,int e ,int[] tree ,int index ) {
  //			if(s == e) {
  //				tree[index] = a[s];
  //				return;
  //			}
  //		
  //			int mid = (s+e)/2;
  //			
  //			buildTree(a, s,  mid, tree, 2*index);
  //			buildTree(a, mid+1, e, tree, 2*index+1);
  //			
  //			tree[index] = tree[2*index] + tree[2*index+1];
  //		}
  	  
  /* ***************************************************************************************************************************************************/	 
  	 
  	      static FR sc = new FR();
  	 static StringBuilder sb = new StringBuilder();
  	 public static void main(String args[]) throws IOException {
  	
  		 int tc = 1;
  		  tc = sc.nextInt();
  		 mod = (long)(1e9 + 7);
  		 while(tc-->0) {
  			 TEST_CASE();
  			 
  		 }
  		 System.out.println(sb);
  	 }
  	 
  	 static void TEST_CASE() {
  		int n = sc.nextInt();
  		 String str = sc.next();
  		for(int i = 0 ; i<n ; i++) {
  			int a = 0;
  			if(str.charAt(i) == 'a') a++;
  			else a--;
  			for(int j = i+1 ; j<n ; j++) {
  				if(str.charAt(j) == 'a') a++;
  				else a--;
  				if(a == 0) {
  					sb.append((i+1)+" "+(j+1)+"\n");
  					return;
  				}
  			}
  		}
  		sb.append("-1 -1\n");
  	 }
  }
  
  
  
  /*******************************************************************************************************************************************************/
  
  /***
  
  */
  
  
  