#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(int)(n);i++)
using namespace std;
using ll = long long ;
using P = pair<int,int> ;
using pll = pair<long long,long long>;
constexpr int INF = 1e9;
constexpr long long LINF = 1e17;
constexpr int MOD = 1000000007;


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