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

int main(){
	string s;
	cin >> s;
	int ans = 0;
	int t = 0;
	for(int i = 0;i < (int)s.size() - 8;){
		if(s.substr(i,9) == "yukicoder"){t++;i += 9;}
		else{
			ans = max(ans,t);
			t = 0;
			i++;
		}
	}
	if(t != 0) ans = max(ans,t);
	cout << ans;
}