#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  char arr[n];
  arr[0] = 'a';
  if (n > 1) arr[1] = 'b';
  if (n > 2) arr[2] = 'c';
  if (n > 3) arr[3] = 'd';
  for (int i = 4; i < n; i++) arr[i] = arr[i - 4];
  for (int i = 0; i < n; i++) cout << arr[i];
}
