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

int main()
{
    string s;
    cin >> s;
    
    int result = -1;

    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.size();k++){
                        if(s[k] == 'w'){
                            if(result == -1) result = k - i + 1;
                            else result = min(result,k - i + 1);
                        }
                    }
                }
            }
        }
    }
    
    cout << result << endl;
    return 0;
}