#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
using namespace std;
string s;
int main(){
    cin >> s;
    int cnt_c = 0, cnt_w = 0;
    for(int i=0, n = s.size(); i<n; ++i){
        if(s[i] == 'c') cnt_c++;
        if(s[i] == 'w') cnt_w++;
    }
    if(cnt_c <= cnt_w){
        cout << cnt_c-1 << endl;
    }else if(cnt_c > cnt_w){
        cout << cnt_w << endl;
    }
        
    return 0;
}