#include <bits/stdc++.h>
using namespace std;
int pis[26];
int main() {
  int n;
  scanf("%d", &n);
  memset(pis, -1, sizeof(pis));
  for (int i = 0; i < n; i++) {
    for (int j = 0; j < 26; j++) {
      int d = i - pis[j];
      if (pis[j] < 0 || d % 4 == 0 || d % 7 == 0) {
        pis[j] = i;
        putchar('a' + j);
        break;
      }
    }
  }
  putchar('\n');
  return 0;
}
