#include <bits/stdc++.h>
#pragma comment(linker, "/STACK:100000000")
using namespace std;
const bool db = false;
int main() {
  int n;
  cin >> n;
  string s;
  for (int i = 0; i < n; i++) s += ('a' + i % 4);
  cout << s << '\n';
  return 0;
}
