source_code: import java.io.*;
  import java.util.Arrays;
  import java.util.StringJoiner;
  import java.util.StringTokenizer;
  import java.util.function.Function;
  
  public class Main {
  
      static String S;
  
      public static void main(String[] args) {
          FastScanner sc = new FastScanner(System.in);
          S = sc.next();
  
          System.out.println(solve());
      }
  
      static int solve() {
          int ans = -1;
          int time = 1;
          int n = S.length();
          for (int i = 1; i < n*2; i++) {
              if( S.charAt((i-1)%n) != S.charAt(i%n) ) {
                  time++;
              } else {
                  ans = Math.max(time, ans);
                  time = 1;
              }
          }
          ans = Math.max(time, ans);
  
          if( ans == n*2 ) {
              return n;
          } else {
              return ans;
          }
      }
  
      @SuppressWarnings("unused")
      static class FastScanner {
          private BufferedReader reader;
          private StringTokenizer tokenizer;
  
          FastScanner(InputStream in) {
              reader = new BufferedReader(new InputStreamReader(in));
              tokenizer = null;
          }
  
          String next() {
              if (tokenizer == null || !tokenizer.hasMoreTokens()) {
                  try {
                      tokenizer = new StringTokenizer(reader.readLine());
                  } catch (IOException e) {
                      throw new RuntimeException(e);
                  }
              }
              return tokenizer.nextToken();
          }
  
          String nextLine() {
              if (tokenizer == null || !tokenizer.hasMoreTokens()) {
                  try {
                      return reader.readLine();
                  } catch (IOException e) {
                      throw new RuntimeException(e);
                  }
              }
              return tokenizer.nextToken("\n");
          }
  
          long nextLong() {
              return Long.parseLong(next());
          }
  
          int nextInt() {
              return Integer.parseInt(next());
          }
  
          int[] nextIntArray(int n) {
              int[] a = new int[n];
              for (int i = 0; i < n; i++)
                  a[i] = nextInt();
              return a;
          }
  
          int[] nextIntArray(int n, int delta) {
              int[] a = new int[n];
              for (int i = 0; i < n; i++)
                  a[i] = nextInt() + delta;
              return a;
          }
  
          long[] nextLongArray(int n) {
              long[] a = new long[n];
              for (int i = 0; i < n; i++)
                  a[i] = nextLong();
              return a;
          }
      }
  
      static <A> void writeLines(A[] as, Function<A, String> f) {
          PrintWriter pw = new PrintWriter(System.out);
          for (A a : as) {
              pw.println(f.apply(a));
          }
          pw.flush();
      }
  
      static void writeLines(int[] as) {
          PrintWriter pw = new PrintWriter(System.out);
          for (int a : as) pw.println(a);
          pw.flush();
      }
  
      static void writeLines(long[] as) {
          PrintWriter pw = new PrintWriter(System.out);
          for (long a : as) pw.println(a);
          pw.flush();
      }
  
      static int max(int... as) {
          int max = Integer.MIN_VALUE;
          for (int a : as) max = Math.max(a, max);
          return max;
      }
  
      static int min(int... as) {
          int min = Integer.MAX_VALUE;
          for (int a : as) min = Math.min(a, min);
          return min;
      }
  
      static void debug(Object... args) {
          StringJoiner j = new StringJoiner(" ");
          for (Object arg : args) {
              if (arg instanceof int[]) j.add(Arrays.toString((int[]) arg));
              else if (arg instanceof long[]) j.add(Arrays.toString((long[]) arg));
              else if (arg instanceof double[]) j.add(Arrays.toString((double[]) arg));
              else if (arg instanceof Object[]) j.add(Arrays.toString((Object[]) arg));
              else j.add(arg.toString());
          }
          System.err.println(j.toString());
      }
  }
  