#include <bits/stdc++.h>

using namespace std;

struct Initializer {
  Initializer() {
    cin.tie(0);
    ios::sync_with_stdio(0);
    cout << fixed << setprecision(15);
  }
} initializer;

int main() {
  string s;
  cin >> s;
  cout << min(count(s.begin(), s.end(), 'c') - 1, count(s.begin(), s.end(), 'w')) << endl;
}