#include <bits/stdc++.h>
using namespace std;


int main() {
    int N; cin >> N;
    auto etoi = [](string s) -> int { 
        vector<string> ary = {"ne","ushi","tora","u","tatsu","mi","uma","hitsuji","saru","tori","inu","i"};
        return (int)(find(ary.begin(), ary.end(), s) - ary.begin()); 
    };
    vector<int> v(12);
    for (int i = 0; i < N; i++) {
        string str; cin >> str;
        v[etoi(str)]++;
    }

    for (auto i : v) {
        if (i > (N + 1) / 2) {
            cout << "NO" << endl;
            return 0;
        }
    }
    cout << "YES" << endl;
    
    return 0;
}