#include <bits/stdc++.h>
using namespace std;
int32_t main() {
  long long n;
  cin >> n;
  long long k = 0;
  for (long long i = 0; i < n; i++) {
    cout << char((long long)('a') + k);
    k++;
    k %= 4;
  }
  cout << "\n";
}
