#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  string s = "aaaaaaaaaa";
  cin >> n;
  for (int i = 0; i < n; ++i) {
    for (int j = 0; j < n; ++j) {
      cout << s[j];
    }
    cout << endl;
    s[n - 1] += 1;
  }
}
