#include <bits/stdc++.h>
using namespace std;
int n;
char s[5] = {'d', 'a', 'b', 'c'};
int main(int argc, char **argv) {
  scanf("%d", &n);
  for (int i = 1; i <= n; ++i) putchar(s[i % 4]);
  return 0;
}
