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