#include <iostream>
#include <map>
using namespace std;
int main(void){
    int  N,cnt[12]={0},max=-1;string str;
    cin >> N;
    map<string,int> eto{
        {"ne",0},
        {"ushi",1},
        {"tora",2},
        {"u",3},
        {"tatsu",4},
        {"mi",5},
        {"uma",6},
        {"hitsuji",7},
        {"saru",8},
        {"tori",9},
        {"inu",10},
        {"i",11}
    };
    for(int i=0;i<N;i++){
        cin >> str;cnt[eto[str]]++;
        if(cnt[eto[str]]>max)max=cnt[eto[str]];
    }
    if(2*max-1<=N)cout << "YES" << endl;
    else cout << "NO" << endl;
    return 0;
}