#include <cstdio>
#include <iostream>
#include <cmath>
#include <cstring> 
#include <sstream>
#include <algorithm>
#include <cstdlib>
#include <map>
#include <queue>
#include <utility>
#include <vector>
#include <set>
#include <memory.h>
#include <iomanip>
#include <bitset>
#include <list>
#include <stack>
 
using namespace std;

#define mod 1000000007

int main()
{
    string s;
    cin >> s;
    int cnum = 0, wnum = 0;
    for(int i = 0; i < s.length(); i++){
        if(s[i] == 'c') cnum++;
        else wnum++;
    }
    cout << min(cnum - 1, wnum) << endl;
    return 0;
}