#include<bits/stdc++.h>
using namespace std;
int main(){
	int n;
	cin>>n;
	for(int i=1;i<=n;i++){
		string s;
		cin>>s;
		if(s=="and" || s=="not" || s=="that" || s=="the" || s=="you"){
			cout<<"Yes";
			return 0;
		}
	}
	cout<<"No";
	return 0;
}