#include<iostream>
#include<algorithm>
#include<cstdio>
#include<cstdlib>
#include<vector>
#include<map>
#include<queue>
#include<string>
#include<sstream>
#include<cmath>
#include<numeric>
using namespace std;

int main(){

  string s;
  cin >> s;

  int cnt = 0;
  for(int i=0; i<s.size(); i++){
    if( s[i] != 'c' ) break;
    cnt++;
  }

  cout << min( cnt - 1, (int)(s.size() - cnt) ) << endl;

  return 0;
}