#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  string a = "a";
  string b = "ab";
  string c = "abc";
  string d = "abcd";
  int complete = n / 4;
  int remain = n % 4;
  for (int i = 0; i < complete; i++) cout << d;
  switch (remain) {
    case 1:
      cout << a;
      break;
    case 2:
      cout << b;
      break;
    case 3:
      cout << c;
      break;
  }
  cout << endl;
  return 0;
}
