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

void fast_io() {
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
}

int main() {
	fast_io();
	string s;
	cin >> s;
	int n = s.size();
	string yukicoder = "yukicoder";
	int ans = 0;
	int cnt = 0, j = 0;
	for (int i = 0; i < n; i++) {
		if (s[i] == yukicoder[j]) {
			j++;
			if (j == 9) {
				cnt++;
				j = 0;
			}
		} else {
			cnt = 0;
			j = 0;
		}
		ans = max(ans, cnt);
	}
	cout << ans << endl;
}