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

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

    int cnt_c = 0,cnt_w = 0;
    for(int i = 0; s[i] == 'c'; i++) cnt_c++;
    for(int i = s.length()-1; s[i] == 'w'; i--) cnt_w++;

    cout << min({cnt_c-1,cnt_w}) << endl;

    return 0;
}