#include<iostream>
#include<string>

using namespace std;

int main(){

	string eto[12]={"ne","ushi","tora","u","tatsu","mi","uma","hitsuji","saru","tori","inu","i"};
	int c[12]={0};
	int N;
	string A;

	cin>>N;

	for(int i=0;i<N;i++){
		cin>>A;
		for(int j=0;j<12;j++){
			if(A==eto[j]){
				c[j]++;
				break;
			}
		}
	}

	int max=c[0];
	for(int i=1;i<12;i++) if(max<c[i]) max=c[i];
	if(max+max-1<=N) cout<<"YES"<<endl;
	else cout<<"NO"<<endl;
}