#include <bits/stdc++.h>
using namespace std;
int main() {
  string s;
  cin >> s;
  int len = s.length();
  string s1;
  string s2;
  s1 = s[0];
  int t = 1;
  int flag = 0;
  int sum = 0;
  while (1) {
    s2 = s[t];
    while (s1 == s2) {
      t++;
      if (len < t) {
        flag = 1;
        break;
      }
      s2 += s[t];
    }
    if (flag == 1) break;
    t++;
    s1 = s2;
    sum++;
  }
  cout << sum;
}
