#include<iostream>
using namespace std;

int main()
{
    string s;
    int result = -1;
    
    cin >> s;
    
    for (int i = 0; i < s.length(); i++) {
        if (s[i] == 'c') {
            for (int j = i+1; j < s.length(); j++) {
                if (s[j] == 'w') {
                    for (int k = j+1; k < s.length(); k++) {
                        if (s[k] == 'w') result = k - i + 1;
                     }
                }
            }
        }
    }
    cout << result << endl;
    
    return 0;
}