#include<iostream>
#include<cstdio>
#include<cstring>
#include<string>
#include<algorithm>
#include<bitset>
#include<vector>
#include<deque>
#include<queue>
#include<map>
#include<set>
#include<stack>
#include<cmath>
#include<iomanip>
#include <functional>
using namespace std;
typedef long long ll;
const int mod = 1000000007;
//cout << fixed << std::setprecision(9)
//memset(a, 0, sizeof(a));
//--------------------------


int main()
{
	string str[12] = { "ne", "ushi", "tora", "u", "tatsu", "mi", "uma", "hitsuji", "saru", "tori", "inu", "i" };
	int count[12];
	memset(count, 0, sizeof(count));

	int n;
	cin >> n;
	for (int i = 0; i < n; i++) {
		string tmp;
		cin >> tmp;
		for (int i = 0; i < 12; i++) {
			if (tmp == str[i]) {
				count[i]++;
			}
		}
	}

	for (int i = 0; i < 12; i++) {
		if (n%2 == 0 && count[i]>n/2) {
			cout << "NO" << endl;
			return 0;
		}
		if (n % 2 == 1 && count[i]>n/2+1) {
			cout << "NO" << endl;
			return 0;
		}

 	}
	cout << "YES" << endl;
	return 0;
}