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