#include <bits/stdc++.h>
using namespace std;
long long i, j, n, t, m, x, z, k, a[100009], b[100009], ans, f, sum;
int main() {
  string s, s1;
  s1 = "abcd";
  cin >> n;
  for (i = 0; i < n; i++) {
    s += s1[i % 4];
  }
  cout << s << endl;
  return 0;
}
