#include <bits/stdc++.h>
using namespace std;
int main() {
  long n, m, i, rem;
  cin >> n;
  m = (int)(n / 4);
  rem = n - (m * 4);
  for (i = 0; i < m; i++) cout << "abcd";
  if (rem == 1)
    cout << "a";
  else if (rem == 2)
    cout << "ab";
  else if (rem == 3)
    cout << "abc";
  return 0;
}
