#include <bits/stdc++.h>
using namespace std;

int main()
{
    string S;
    cin >> S;
    int N = S.size();
    int c = 0;
    int w = 0;
    for (int i = 0; i < N; i++)
    {
        if (S[i] == 'c')
        {
            c++;
        }
        if (S[i] == 'w')
        {
            w++;
        }
    }
    int ans = min(c - 1, w);
    ans = max(ans, 0);
    cout << ans;
}