#include <bits/stdc++.h>
int main() {
  int n;
  scanf("%d", &n);
  char arr[100010];
  arr[0] = 'a';
  arr[1] = 'b';
  arr[2] = 'c';
  arr[3] = 'd';
  char e = 'e';
  if (n > 4) {
    int i;
    for (i = 4; i < n; i++) {
      arr[i] = arr[i - 4];
    }
    arr[i] = '\0';
    printf("%s\n", arr);
  } else {
    arr[n] = '\0';
    printf("%s\n", arr);
  }
  return 0;
}
