#include <bits/stdc++.h>
using namespace std;
int main() {
  string s = "abcd";
  int n;
  cin >> n;
  while (s.size() < n) {
    s += s;
  }
  for (int i = 0; i < n; i++) cout << s[i];
  cout << "\n";
  return 0;
}
