#include <bits/stdc++.h>
using namespace std;
int main(int argc, char** argv) {
  string x = "";
  int n;
  cin >> n;
  int l = n / 4;
  int m = n % 4;
  for (int i = 0; i < l; i++) {
    x += "abcd";
  }
  char c = 'a';
  for (int i = 0; i < m; i++) {
    x += c;
    c++;
  }
  cout << x << endl;
  return 0;
}
