import java.util.Scanner;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;

class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        String[] a = new String[n];

        for(int i=0; i<n; i++) {
            a[i] = in.next();
        }

        /*
          N個の干支の置物がある
          12種類の干支のうち、どれかひとつでもN/2＋1個以上あれば
          隣に置かざるをえない
         */

        String[] eto = {"ne", "ushi", "tora", "u", "tatsu", "mi", "uma", "hitsuji", "saru", "tori", "inu", "i"};

        String ans = "";

        if(n == 2 && a[0].equals(a[1])) {
            ans = "NO";
        } else {
            ans = "YES";
        }

        for(int i=0; i<12; i++) {
            int count = 0;
            for(int j=0; j<n; j++) {
                if(a[j].equals(eto[i])) {
                    count++;
                }
            }
            if(count > (n+1) / 2) {
                ans = "NO";
                break;
            }
        }

        System.out.println(ans);

        in.close();
    }
}