import java.util.*;

public class Main {
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		String[] etoes = new String[]{"ne", "ushi", "tora", "u", "tatsu", "mi", "uma", "hitsuji", "saru", "tori", "inu", "i"};
		HashMap<String, Integer> idxes = new HashMap<>();
		for (int i = 0; i < etoes.length; i++) {
		    idxes.put(etoes[i], i);
		}
		int[] counts = new int[etoes.length];
		int n = sc.nextInt();
		for (int i = 0; i < n; i++) {
		    counts[idxes.get(sc.next())]++;
		}
		Arrays.sort(counts);
		if (counts[counts.length - 1] > (n + 1) / 2) {
		    System.out.println("NO");
		} else {
		    System.out.println("YES");
		}
	}
}