#include <bits/stdc++.h>
using namespace std;
int N, M, T;
int main() {
  int i, j, k;
  scanf("%d", &N);
  k = 1;
  for (i = 1; i <= N; i++) {
    switch (k) {
      case 1:
        printf("a");
        break;
      case 2:
        printf("b");
        break;
      case 3:
        printf("c");
        break;
      case 4:
        printf("d");
        break;
    }
    k++;
    if (k > 4) k = 1;
  }
  scanf(" ");
}
