#include<iostream>
#include<string>
using namespace std;

int main(){
    int c1=0,c2=0;
    string S;
    cin >> S;
    for(int i=0;i<S.size();i++){
        if(S[i]=='c')    c1++;
        else    c2++;
    }
    if(c1<=2||c2<=1)    cout << 0;
    else if((c1-2)>c2-1) cout << c2-1;
    else cout << c1-2;
    return 0;
}