#include <bits/stdc++.h>
using namespace std;
int main() {
  int t;
  t = 1;
  while (t--) {
    int n;
    cin >> n;
    string s = "";
    for (int i = 1; i <= n / 4; i++) s = s + "abcd";
    if (n % 4 == 1) s = s + "a";
    if (n % 4 == 2) s = s + "ab";
    if (n % 4 == 3) s = s + "abc";
    cout << s;
  }
  return 0;
}
