#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using Graph = vector<vector<int>>;
long long primeNumber(long long x) {
  bool fire = true;
  for(int i = 2; i <= sqrt(x); i++) {
    if(x % i == 0) {
      fire = false;
    }
  }
  return fire;
}
int main() {
  string S; cin >> S;
  int c = 0;
  int w = 0;
  for(int i = 0; i < S.size(); i++) {
    if('c' == S[i]) c++;
    if('w' == S[i]) w++;
  }
 
  if(c < 2 || w < 1) {
    cout << 0 << endl;
  }else {
    cout << min(c,w) << endl;
  }
}