#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  string p = "abcdefghijklmnopqrstuvwxyz";
  string t = "";
  if (n <= 4) {
    t = p.substr(0, n);
    cout << t;
  } else {
    string s = "abcd";
    int l = n % 4;
    int p = n / 4;
    if (l == 0) {
      while (p--) {
        t += "abcd";
      }
    } else {
      while (p--) {
        t += s;
      }
      if (l == 1) t += 'a';
      if (l == 2) t += "ab";
      if (l == 3) t += "abc";
    }
    cout << t;
  }
}
