#include <iostream>
#include <algorithm>
#include<vector>
#include<string>
using namespace std ;
int main()
{
string a , b , c;
int t ;
cin >> t ;
while(t--)
{
cin >> a ;
b+=a ;
}
c = b ;
reverse(c.begin() , c.end());
cout<<b;
if(c==b) cout<<"YES/n" ;
else cout<<"NO/n";
return 0 ;
}
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