#include <iostream>
using namespace std ;
using ll = long long ;
int main() {
   int n ;
   cin >> n ;
   ll w = 0 ;
   for (int i=2; i<=n+1; i++) {
      int g = (i & 1) * 5 ;
      int t = i >> 1 ;
      while (t % 26 == 0) {
         g++ ;
         t /= 26 ;
      }
      for (int j=0; j<10; j++) {
         ll c = ((w >> (5 * j)) & 31) ;
         cout << (char)('a' + c) ;
         if (j == g) {
            ll c2 = (c + 1) % 26 ;
            w += (c2 - c) << (5 * j) ;
         }
      }
      cout << endl ;
   }
}