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