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

typedef modint998244353 mint;
typedef long long ll;

int main(){
	string s;
	cin >> s;
	int n = s.size();
	int i = 0;
	int ans = 0;
	int now = 0;
	string t = "yukicoder";
	while (i < n){
		if (i+8 >= n) break;
		bool mode = true;
		for (int j=0; j<7; j++){
			if (t[j] != s[i+j]) mode = false;
		}
		if (mode){
			now++;
			ans = max(ans, now);
			i += 9;
		}else{
			now = 0;
			i++;
		}
	}
	cout << ans << endl;
}