import java.util.*;
class A {
	static Scanner s = new Scanner(System.in);
	static enum ETO{
		ne,
		ushi,
		tora,
		u,
		tatsu,
		mi,
		uma,
		hitsuji,
		saru,
		tori,
		inu,
		i,
		;

		int amount=0;

		static ETO match(String s) {
			boolean b = false;
			for(ETO eto:ETO.values()) {
				if(s.matches(eto.name())) {
					eto.amount++;
					return eto;
				}
			}
			return null;
		}
		@Override
		public String toString() {
			return this.name()+":"+this.amount;
		}
	}
	public static void main(String[] args) {
		int in = s.nextInt();
		while(s.hasNext()) {
			ETO.match(s.next());
		}
		int max = 0;
		for(ETO e:ETO.values()) {
			max = Math.max(max, e.amount);
		}
		if(max>in/2+1) {
			System.out.println("NO");
		}else {
			System.out.println("YES");
		}
	}
}