#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  while (cin >> n) {
    string s = "";
    string s1 = "abcd";
    while (n >= 4) {
      s += s1;
      n -= 4;
    }
    if (n == 1) {
      s += "a";
    } else if (n == 2) {
      s += "ab";
    } else if (n == 3) {
      s += "abc";
    }
    cout << s << endl;
  }
  return 0;
}
