#include <bits/stdc++.h>
using namespace std;
const long long lmax = LONG_LONG_MAX;
const int imax = INT_MAX;
const int mod = 1000000007;
int main() {
  cin.tie(0);
  ios_base::sync_with_stdio(0);
  int n;
  cin >> n;
  for (int i = 0; i < n / 4; i++) cout << "abcd";
  if (n % 4 == 1) cout << 'a';
  if (n % 4 == 2) cout << "ab";
  if (n % 4 == 3) cout << "abc";
  return 0;
}
