#include <iostream>
#include <vector>
#include <algorithm>
#include <math.h>
#include <map>

#define ALL(x) (x).begin(),(x).end()
#define RALL(x) (x).rbegin(),(x).rend()
#define REP(i,a,n) for(int i = (a);i < (n);i++)
#define PI 3.14159265359
#define MOD 1000000007

using namespace std;

int main(){
    int n,max;
    string ans = "YES\n";
    cin >> n;
    max = (n + 1)/2;
    map<string,int> eto =
    { {"ne",0},{"ushi",0},{"tora",0},{"u",0},{"tatsu",0},{"mi",0},{"uma",0},{"hitsuji",0},{"saru",0},{"tori",0},{"inu",0},{"i",0}};
    REP(i, 0, n){
        string s;
        cin >> s;
        eto[s]++;
        if(eto[s] > max)ans = "NO\n";
    }
    cout << ans;
    return 0;
}