#include <iostream>
#include <math.h>
#include <algorithm>
#include <functional>
#include <vector>
#include <typeinfo>
#include <climits>
#include <ctype.h>
#include <string>
#include <stack>
using namespace std;
#define FOR(i, a, n) for (int i = a; i < n; i++)
#define REP(i, n) for(int i = 0; i < n; i++)
struct omt{omt(){ios::sync_with_stdio(false);cin.tie(0);}}star;

int main(){
    string s;
    cin >> s;

    int c_c = count(s.begin(), s.end(), 'c');    
    int w_c = count(s.begin(), s.end(), 'w');

    if(c_c > w_c) cout << w_c << endl;
    else cout << c_c - 1 << endl;

    return 0;
}