#include <bits/stdc++.h>

using namespace std;

int occ[12];

int main()
{
    string ar[]={"ne","ushi","tora","u","tatsu","mi","uma","hitsuji","saru","tori","inu","i"};

    int n;
    cin>>n;
    set<string> mp;
    for(int ctr1=0;ctr1<n;ctr1++)
    {
        string t;
        cin>>t;
        int cur=-1;
        for(int ctr2=0;ctr2<12;ctr2++){
            if(ar[ctr2]==t)
                cur=ctr2;
        }
        occ[cur]++;
    }
    for(int ctr1=0;ctr1<12;ctr1++)
    {
        if(occ[ctr1]>(n+1)/2)
        {
            cout<<"NO"<<endl;
            return 0;
        }
    }
    cout<<"YES"<<endl;
    return 0;
}