using System;
using System.Linq;
using System.Collections.Generic;

namespace program{
	class program{
		static void Main(string[] args){
			var eto = new string[12] {"ne","ushi","tra","u","tatsu","mi","uma","hitsuji","saru","tori","inu","i"};
			var cnt = new int[12];
			
			int n = int.Parse(Console.ReadLine());
			for( int i = 0; i < n; i++){
				string str = Console.ReadLine();
			
				for( int j = 0; j < 12; j++){
					if( eto[j] == str ){
						cnt[j]++;
					}
				}			
			}

			if( cnt.Max() <= (n+1) / 2 ){
				Console.WriteLine("YES");
			}
			else{
				Console.WriteLine("NO");
			}
		}
	}
}