#include <bits/stdc++.h>
using namespace std;
bool islucky(int x) {
  if (x == 0) return false;
  while (x) {
    if (x % 10 != 4 && x % 10 != 7) return false;
    x /= 10;
  }
  return true;
}
int main() {
  ios::sync_with_stdio(false);
  int n;
  cin >> n;
  for (register int i = (0); i < (int)(n); ++i) cout.put(i % 4 + 'a');
  cout << "\n";
  return 0;
}
