#include <bits/stdc++.h>
#define rep(i,a,b) for(int i=a;i<b;i++)

using namespace std;

int main(){
	
	string s[] = {"ne","ushi","tora","u","tatsu","mi","uma",
					"hitsuji","saru","tori","inu","i"}
	, str[50];

	int n,ar[12]={};
	cin>>n;
	rep(i,0,n){
		cin>>str[i];
	}

	rep(i,0,n){
		rep(j,0,12){
			if(str[i] == s[j]){
				ar[j]++;
			}
		}
	}
	sort(ar,ar+12);

	int tmp = -1;
	bool f;
	rep(i,0,n){
		for(int j=11; 0<=j; j--){
			f = false;
			if(j != tmp && ar[j]!=0){
				ar[j]--;
				tmp = j;
				f = true;

				break;
			}
		}
		if(!f){
			cout<<"NO"<<endl;
			return 0;
		}
	}

	cout<<"YES"<<endl;
	
	return 0;
}