#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  char ch = 'a';
  for (int i = 0; i < n; i++) {
    if (n < 5) {
      cout << ch;
      ch++;
      continue;
    } else {
      if (ch == 'd') {
        cout << ch;
        ch = 'a';
      } else {
        cout << ch;
        ch++;
      }
    }
  }
}
