#include <bits/stdc++.h>
using namespace std;
long long y, n, k;
int main() {
  int n, t = 0;
  cin >> n;
  string s = "abcd";
  t = n / 4;
  while (t--) {
    cout << s;
  }
  int c = n % 4;
  for (int i = 0; i < c; i++) {
    cout << char(i + 'a');
  }
  return 0;
}
