#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;
using ld = long double;

string s;
int c, w;

int main() {
  cin >> s;
  for (int i = 0; i < s.size(); i++) {
    if (s[i] == 'c') c++;
    if (s[i] == 'w') w++;
  }
  cout << min(c - 1, w) << endl;
  return 0;
}