#include <bits/stdc++.h>
using namespace std;
void print(set<int> s) {
  for (set<int>::iterator iter = s.begin(); iter != s.end(); ++iter)
    cout << *iter << ' ';
  cout << endl;
}
int main() {
  int n;
  cin >> n;
  for (int i = 0; i < n / 4; ++i) cout << "abcd";
  for (int i = 0; i < n % 4; ++i) cout << char(int('a') + i);
  return 0;
}
