#define _USE_MATH_DEFINES
#include <algorithm>
#include <cstdio>
#include <functional>
#include <iostream>
#include <cfloat>
#include <climits>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <map>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
using namespace std;

typedef long long ll;

int MOD = 1000000007;

int main() {
	int N; cin >> N;
	vector<int> a(12);
	for (int i = 0; i < N; i++) {
		string s; cin >> s;
		if (s == "ne") a[0]++;
		if (s == "ushi") a[1]++;
		if (s == "tora") a[2]++;
		if (s == "u") a[3]++;
		if (s == "tatsu") a[4]++;
		if (s == "mi") a[5]++;
		if (s == "uma") a[6]++;
		if (s == "hitsuji") a[7]++;
		if (s == "saru") a[8]++;
		if (s == "tori") a[9]++;
		if (s == "inu") a[10]++;
		if (s == "i") a[11]++;
	}
	bool ok = true;
	for (int k = 0; k < 12; k++)
		if (a[k] * 2 - 1 > N)
			ok = false;
	cout << (ok ? "YES" : "NO") << endl;
}