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