#include <bits/stdc++.h>
using namespace std;

int main() {
	string s;
	cin >> s;
	for (int ans = 1; ans <= s.size(); ans++) {
		bool ok = false;
		for (int i = 0; i + ans - 1 < s.size(); i++) {
			string t = s.substr(i, ans);
			bool c1 = false, c2 = false, c3 = false;
			for (int j = 0; j < t.size(); j++) {
				if (!c1 && t[j] == 'c') c1 = true;
				else if (t[j] == 'w') {
					if (!c1) continue;
					else if (!c2) c2 = true;
					else if (!c3) c3 = true;
				}
			}
			if (c1 && c2 && c3) ok = true;
		}
		if (ok) {
			cout << ans << endl;
			return 0;
		}
	}
	cout << -1 << endl;
}