#include <bits/stdc++.h>
using namespace std;
int main() {
  int a[] = {'a', 'b', 'c', 'd'};
  int n;
  cin >> n;
  int i = 0;
  while (i < n) {
    int j = 0;
    while (j < 4 && i + j < n) {
      cout << (char)(a[j]);
      j++;
    }
    i += j;
  }
  return 0;
}
