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

int main() {
	string s;
	cin >> s;

	int N = s.size(), ans = 0, a = 0;
	string t = "yukicoder";
	for( int i = 0; i < N; i++ ) {
		if( s.substr( i, 9 ) == t ) {
			a++;
			i += 9 - 1;
		}
		else a = 0;
		ans = max( ans, a );
	}
	cout << ans << endl;
}