package yukicoder;

import java.util.Scanner;

public class No349 {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		sc.nextLine();
		String[] s = new String[N];
		int[] eto = new int[12];
		for (int i = 0; i < s.length; i++) {
			s[i] = sc.nextLine();
			switch (s[i]) {
			case "ne":
				eto[0]++;
				break;
			case "ushi":
				eto[1]++;
				break;
			case "tora":
				eto[2]++;
				break;
			case "u":
				eto[3]++;
				break;
			case "tatsu":
				eto[4]++;
				break;
			case "mi":
				eto[5]++;
				break;
			case "uma":
				eto[6]++;
				break;
			case "hitsuji":
				eto[7]++;
				break;
			case "saru":
				eto[8]++;
				break;
			case "tori":
				eto[9]++;
				break;
			case "inu":
				eto[10]++;
				break;
			case "i":
				eto[11]++;
				break;
			}
		}
		boolean b = false;
		for (int i = 0; i < 12; i++) {
			int t = N;
			t -= eto[i];
			if (!(eto[i] - 1 <= t)) {
				b = true;
			}
		}
		if (b) {
			System.out.println("NO");
		} else {
			System.out.println("YES");
		}
	}
}