#include <bits/stdc++.h>
using namespace std;
int main() {
  long long n, m;
  cin >> n;
  string x = "abcd";
  long long l = 4;
  long long q = n / 4;
  long long r = n % 4;
  for (long long i = 0; i < q; i++) {
    cout << x;
  }
  cout << x.substr(0, r);
}
