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

int main(){
    map<string,int> mp;
    mp["ne"]=0;mp["ushi"]=1;mp["tora"]=2;mp["u"]=3;mp["tatsu"]=4;mp["mi"]=5;mp["uma"]=6;mp["hitsuji"]=7;mp["saru"]=8;mp["tori"]=9;mp["inu"]=10;mp["i"]=11;
    vector<int> v(12,0);
    int N;
    string in;

    cin >> N;
    while(cin >> in) v[mp[in]]++;
    sort(v.begin(),v.end());
    if(accumulate(v.begin(),v.end()-1,0)>=v.back()-1) cout << "YES" << endl;
    else cout << "NO" << endl;

    return 0;
}