// ccw
#include <iostream>
#include <cstdio>
using namespace std;

char s[100005] = {};
int count_c, count_w;

int main() {
    int i = 0;
    scanf("%s", s);
    while(i < 100000) {
        if(s[i] == 'c') count_c++;
        else if(s[i] == 'w') count_w++;
        i++;
    }
    cout << min(count_c - 1, count_w) << endl;
    return 0;
}