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