#include <bits/stdc++.h>
using namespace std;
int n, i, b[30], j;
char a[100005], x, y;
int main() {
  cin >> n;
  a[0] = 'a';
  a[1] = 'b';
  a[2] = 'c';
  a[3] = 'd';
  for (i = 4; i < n; ++i) {
    a[i] = a[i - 4];
  }
  for (i = 0; i < n; ++i) cout << a[i];
  return 0;
}
