#define _USE_MATH_DEFINES
#include<iostream>
#include<sstream>
#include<vector>
#include<string>
#include<algorithm>
#include<map>
#include<unordered_map>
#include<math.h>
#include<iterator>

using namespace std;
int main(){
  string s;
  cin >> s;
  map<char ,int> countm;
  for (auto&& it : s) {
    countm[it]++;
  }
  cout << min(countm['c']-1,countm['w'])<<endl;
}