#include <bits/stdc++.h>
using namespace std;
signed main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  string s;
  cin >> s;
  int n = (int)s.size();
  int ans = 1;
  if (s.front() != s.back()) {
    int f = 1;
    for (int i = 1; i < n; i++) {
      if (s[i] != s[i - 1]) {
        f++;
      } else {
        break;
      }
    }
    if (f == n) {
      cout << n << endl;
      return 0;
    }
    int ss = 1;
    for (int i = (int)s.size() - 2; i >= 0; i--) {
      if (s[i] != s[i + 1]) {
        ss++;
      } else {
        break;
      }
    }
    ans = max(ans, ss + f);
  }
  for (int i = 0; i < n; i++) {
    int tmp = 1;
    for (int j = i + 1; j < n; j++) {
      if (s[j - 1] != s[j]) {
        tmp++;
      } else {
        i = j - 1;
        break;
      }
    }
    ans = max(ans, tmp);
  }
  cout << ans << endl;
}
