#include <bits/stdc++.h>
using namespace std;
int main() {
  char c[4] = {'a', 'b', 'c', 'd'};
  string res = "";
  int n;
  cin >> n;
  for (int i = 0; i < n; i++) {
    int k = i % 4;
    res += c[k];
  }
  cout << res;
}
