#include<bits/stdc++.h>
using namespace std;
using Int = long long;
//INSERT ABOVE HERE
signed main(){
  vector<string> s({"ne",
		    "ushi",
		    "tora",
		    "u",
		    "tatsu",
		    "mi",
		    "uma",
		    "hitsuji",
		    "saru",
		    "tori",
		    "inu",
		    "i"});

  map<string, Int> m;
  for(Int i=0;i<12;i++) m[s[i]]=i;

  Int n;
  cin>>n;
  vector<Int> a(12);
  for(Int i=0;i<n;i++){
    string t;
    cin>>t;
    a[m[t]]++;
  }
  for(Int i=0;i<12;i++){
    if(n-a[i]<a[i]-1){
      cout<<"NO"<<endl;
      return 0;
    }
  }
  cout<<"YES"<<endl;
  return 0;
}