#include<bits/stdc++.h>
using namespace std;
int main(){
 int n;cin>>n;int a[]={0,0,0,0,0,0,0,0,0,0,0,0};
 for(int i=0;i<n;i++){
  string s;cin>>s;
  if(s=="ne")a[0]++;
  else if(s=="ushi")a[1]++;
  else if(s=="tora")a[2]++;
  else if(s=="u")a[3]++;
  else if(s=="tatsu")a[4]++;
  else if(s=="mi")a[5]++;
  else if(s=="uma")a[6]++;
  else if(s=="saru")a[7]++;
  else if(s=="tori")a[8]++;
  else if(s=="inu")a[9]++;
  else if(s=="i")a[10]++;
  else a[11]++;
 }
 int m;
 if(n%2==0)m=n/2;
 else m=(n+1)/2;
 for(int i=0;i<12;i++){
  if(a[i]>m){
   cout<<"NO"<<endl;
   return 0;
  }
 }
 cout<<"YES"<<endl;
}