import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Map;
import static java.lang.System.in;

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(in));
        int N = Integer.parseInt(reader.readLine());

        String[] ornaments = new String[]{"ne", "ushi", "tora", "u", "tatsu", "mi", "uma", "hitsuji", "saru", "tori", "inu", "i"};
        Map<String, Integer> map = new HashMap<>();
        for (int i = 0; i < 12; i++) {
            map.put(ornaments[i], i);
        }
        int[] table = new int[12];
        for (int i = 0; i < N; i++) {
            String ornament = reader.readLine();
            table[map.get(ornament)] += 1;
        }
        String answer = "YES";
        for (int i = 0; i < 12; i++) {
            if (table[i] > ((N+1) / 2)) {
                answer="NO";
                break;
            }
        }
        System.out.println(answer);
    }
}