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

int main() {
    int n,n2,a[12] = {};
    vector<string> test = {"ne","ushi","tora","u","tatsu","mi","uma","hitsuji","saru","tori","inu","i"};
    cin >> n;
    for(int i = 0; i < n;i++){
        string s;
        cin >> s;
        for(int j = 0;j < 12;j++){
            if(s == test[j])a[j]++;
        }
    }
    n2 = n/2;
    if(n%2 != 0)n2++;
    string ans = "YES\n";
    for(int i = 0;i < 12; i++){
        if(a[i] > n2){
            ans = "NO\n";
            break;
        }
    }
    cout << ans;
return 0;
}