#include <bits/stdc++.h>
using namespace std;
int64_t ar[100010];
int32_t main() {
  ios::sync_with_stdio(0);
  cin.tie(NULL);
  string ans = "";
  string temp = "abcd";
  int64_t n;
  cin >> n;
  for (int64_t i = 0; i < n; i++) {
    ans += temp[i % 4];
  }
  cout << ans << "\n";
  return 0;
}
