#include <bits/stdc++.h>
using namespace std;
int solve() {
  long long n;
  cin >> n;
  for (long long int i = 0; i < n; i++) {
    long long r = i % 4;
    if (r == 0)
      cout << 'a';
    else if (r == 1)
      cout << "b";
    else if (r == 2)
      cout << "c";
    else
      cout << "d";
  }
  return 0;
}
int main() {
  auto start = chrono::high_resolution_clock::now();
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  long long test_cases = 1;
  while (test_cases--) solve();
  auto stop = chrono::high_resolution_clock::now();
  auto duration = chrono::duration_cast<chrono::milliseconds>(stop - start);
}
