import java.util.*;
import java.math.*;

public class Main {
    private static Scanner sc = new Scanner(System.in);
    public static void main(String[] args) throws Exception {
        int n = sc.nextInt();
        int[] ary = new int[12];
        for (int i = 0;i < n;i++) {
            String s = sc.next();
            if (s.equals("ne")) ary[0]++;
            if (s.equals("ushi")) ary[1]++;
            if (s.equals("tora")) ary[2]++;
            if (s.equals("u")) ary[3]++;
            if (s.equals("tatsu")) ary[4]++;
            if (s.equals("mi")) ary[5]++;
            if (s.equals("uma")) ary[6]++;
            if (s.equals("hitsuji")) ary[7]++;
            if (s.equals("saru")) ary[8]++;
            if (s.equals("tori")) ary[9]++;
            if (s.equals("inu")) ary[10]++;
            if (s.equals("i")) ary[11]++;
        }
        int max = 0;
        for (int i = 0;i < 12;i++) {
            max = Math.max(max,ary[i]);
        }
        if (n%2==0) {
            if (max>n/2) {
                System.out.println("NO");
            } else {
                System.out.println("YES");
            }
        } else {
            if (max>(n+1)/2) {
                System.out.println("NO");
            } else {
                System.out.println("YES");
            }
        }
    }
}