#include <bits/stdc++.h>
using namespace std;
void read_file(bool outToFile = true) {}
int main() {
  read_file();
  string a = "abcd";
  int n;
  while (cin >> n) {
    for (int i = 0; i < n; i++) cout << a[i % 4];
    cout << '\n';
  }
}
