#include <stdio.h>
#include <atcoder/all>
#include <bits/stdc++.h>
using namespace std;
using namespace atcoder;
using mint = modint998244353;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf32 1000000001
#define Inf64 4000000000000000001

int main(){
	
	string s;
	cin>>s;
	int cur = 0;
	int ans = 0;
	rep(i,s.size()){
		if(s.substr(i,9)=="yukicoder"){
			cur++;
			ans = max(ans,cur);
			i += 8;
		}
		else{
			cur = 0;
		}
	}
	cout<<ans<<endl;
	
	return 0;
}