#include <stdio.h>
#include <algorithm>
#include <iostream>
#include <string>
#include <vector>
#include <functional>
#include <map>
#include <iomanip>
#include <math.h> 
#include <stack>
#include <queue>
#include <bitset>
#include <cstdlib>
#include <tuple>
#include <cctype>
#include <ctype.h>
#include <set>
#include <sstream>

using namespace std;


int main() {
	int i, j, k;
	string s;

	cin >> s;

	for (i = 0; i < s.length(); i++) {
		if (s[i] == 'c') {
			int cnt = 0;
			int iti = -1;

			for (j = i + 1; j < s.length(); j++) {
				//if (s[j] == 'c') break;
				if (s[j] == 'w') {
					cnt++;
					iti = j;
				}
				if (cnt >= 2 && iti != -1) {
					cout << j-i << endl;
					getchar();
					getchar();
					return 0;
				}
			}
			
		}
	}

	cout << -1 << endl;




	getchar();
	getchar();
	return 0;
}