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

public class yukicoder
{
    public static void Main()
    {
		int n = int.Parse(Console.ReadLine());
		int[] eto = new int[12];
		string s = "";
		string ans = "YES";

		for(int i = 0; i <= n - 1; i++)
		{
			s = Console.ReadLine();
			
			if(s == "ne") eto[0] ++;
			else if(s == "ushi") eto[1] ++;
			else if(s == "tora") eto[2] ++;
			else if(s == "u") eto[3] ++;
			else if(s == "tatsu") eto[4] ++;
			else if(s == "mi") eto[5] ++;
			else if(s == "uma") eto[6] ++;
			else if(s == "hitsuji") eto[7] ++;
			else if(s == "saru") eto[8] ++;
			else if(s == "tori") eto[9] ++;
			else if(s == "inu") eto[10] ++;
			else if(s == "i") eto[11] ++;
		}
		
		if(n % 2 == 0 && eto.Max() > n / 2)
		{
			ans = "NO";
		}
		else if(n % 2 != 0 && eto.Max() > (n / 2) + 1)
		{
			ans = "NO";
		}

		Console.WriteLine(ans);

    }
}