#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, i;
  char c;
  while (~scanf("%d", &n)) {
    c = 'a';
    for (i = 1; i <= n; i++) {
      printf("%c", c);
      c++;
      if (c == 'e') c = 'a';
    }
    puts("");
  }
  return 0;
}
