#include <iostream>
#include <cstdlib>
using namespace std ;
using ll = long long ;
int main() {
   int n ;
   cin >> n ;
   ll w = 0 ;
   for (int i=0; i<n; i++) {
      cout << ' '; // leading space
      for (int j=0; j<10; j++) {
         ll c = ((w >> (5 * j)) & 31) ;
         cout << (char)('a' + c) ;
         if (i % 10 == j) {
            ll c2 = (int)(26 * drand48()) ;
            while (c == c2)
               c2 = (int)(26 * drand48()) ;
            w += (c2 - c) << (5 * j) ;
         }
      }
      cout << "   " << endl ; // trailing spaces
   }
}