#include <bits/stdc++.h>
using namespace std;
int main() {
  int len;
  cin >> len;
  for (int i = 0; i < len; i++) {
    int k = i % 4;
    switch (k) {
      case 0:
        cout << 'a';
        break;
      case 1:
        cout << 'b';
        break;
      case 2:
        cout << 'c';
        break;
      case 3:
        cout << 'd';
        break;
    }
  }
  cout << endl;
  return 0;
}
