#include <bits/stdc++.h>

using namespace std;

#define REP(i, n) for(int i = 0; i < n; i++)

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