#include <bits/stdc++.h>
using namespace std;
long long int fact(long long int n) {
  if (n == 1 || n == 0)
    return 1;
  else
    return n * fact(n - 1);
}
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  ;
  int n;
  cin >> n;
  if (n == 1)
    cout << "a"
         << "\n";
  else if (n == 2)
    cout << "ab"
         << "\n";
  else if (n == 3)
    cout << "abc"
         << "\n";
  else {
    for (int i = 0; i < n; i++) {
      if (i % 4 == 0) cout << "a";
      if (i % 4 == 1) cout << "b";
      if (i % 4 == 2) cout << "c";
      if (i % 4 == 3) cout << "d";
    }
  }
  return 0;
}
