#include <bits/stdc++.h>
using namespace std;
int main() {
  long long n, i, p, q;
  cin >> n;
  if (n == 1)
    cout << 'a' << endl;
  else if (n == 2)
    cout << "ab" << endl;
  else if (n == 3)
    cout << "abc" << endl;
  else {
    p = n / 4;
    q = n % 4;
    for (i = 1; i <= p; i++) cout << "abcd";
    if (q != 0) {
      if (q == 1)
        cout << 'a';
      else if (q == 2)
        cout << "ab";
      else if (q == 3)
        cout << "abc";
    }
    cout << endl;
  }
}
