#include <iostream>
#include <iomanip>
#include <vector>

typedef long long ll;

int main(void)
{
  std::cin.tie(0);
  std::ios::sync_with_stdio(false);
  std::cout << std::fixed << std::setprecision(3);
  std::vector< std::string > eto = {"ne", "ushi", "tora", "u", "tatsu", "mi", "uma", "hitsuji", "saru", "tori", "inu", "i"};
  int n;
  std::cin >> n;
  std::vector< int > cnt(12, 0);
  for (int i = 0; i < n; ++i) {
    std::string s;
    std::cin >> s;
    for (int j = 0; j < 12; ++j) {
      if (s == eto[j]) cnt[j]++;
    }
  }
  for (int j = 0; j < 12; ++j) {
    if (cnt[j]*2-1 > n) {std::cout << "NO" << std::endl; return 0;}
  }
  std::cout << "YES" << std::endl;
  return 0;
}