#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, i, rep;
  string a = "abcd";
  cin >> n;
  rep = n % 4;
  n /= 4;
  for (i = 0; i < n; i++) cout << a;
  for (i = 0; i < rep; i++) cout << a[i];
  return 0;
}
