#include <iostream>
#include <string>
#include <vector>
#define rep(i, n) for(i = 0; i < n; i++)
using namespace std;

int main() {
	int i, j;
	vector<int> pos;
	string s;

	cin >> s;
	int n = s.length();

	string key = "yukicoder";
	int ans = 0, score = 0;
	for (i = 0; i <= n - key.length(); ) {
		rep(j, key.length()) {
			if (s[i + j] != key[j]) break;
		}
		if (j == key.length()) { i += key.length(); score++; ans = max(ans, score); }
		else { i++; score = 0; } 
	}
	ans = max(ans, score);

	cout << ans << endl;
	return 0;
}