#include <iostream>
#include <string>
#include <algorithm>
using namespace std;

int main(){
    int n,x[12] = {};
    cin >> n;
    string a;
    for(int i = 0; i < n; i++){
        cin >> a;
        if(a == "ne") x[0]++;
        if(a == "ushi") x[1]++;
        if(a == "tora") x[2]++;
        if(a == "u") x[3]++;
        if(a == "tatsu") x[4]++;
        if(a == "mi") x[5]++;
        if(a == "uma") x[6]++;
        if(a == "hitsuji") x[7]++;
        if(a == "saru") x[8]++;
        if(a == "tori") x[9]++;
        if(a == "inu") x[10]++;
        if(a == "i") x[11]++;
    }

    cout << (*max_element(x,x+12) <= n / 2 + n % 2 ? "YES" : "NO")<< endl; 

    return 0;
}