#include <bits/stdc++.h>
using namespace std;
int main() {
  std::ios::sync_with_stdio(false);
  int n;
  cin >> n;
  char ar[4] = {'a', 'b', 'c', 'd'};
  for (int i = 0; i < n; i++) {
    cout << ar[i % 4] << "";
  }
  cout << endl;
  return 0;
}
