#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  string s = "";
  cin >> n;
  while (true) {
    for (char ch = 'a'; ch <= 'a' + 3; ch++) {
      s += ch;
      if (s.length() == n) {
        cout << s << endl;
        return 0;
      }
    }
  }
}
