#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  int a[110];
  scanf("%d", &n);
  int cntxiao = 0;
  int cntda = 0;
  for (int i = 0; i < n; i++) {
    scanf("%d", &a[i]);
    if (a[i] < 0) cntxiao++;
    if (a[i] > 0) cntda++;
  }
  sort(a, a + n);
  if (cntxiao % 2 == 0) {
    if (a[n - 1] > 0) {
      printf("1 %d\n", a[0]);
      printf("%d", cntda);
      for (int i = cntxiao + 1; i < n; i++) {
        printf(" %d", a[i]);
      }
      printf("\n");
      printf("%d 0", cntxiao);
      for (int i = 1; i < cntxiao; i++) {
        printf(" %d", a[i]);
      }
      printf("\n");
    } else {
      printf("1 %d\n", a[0]);
      printf("%d", cntxiao - 2);
      for (int i = 2; i < cntxiao; i++) {
        printf(" %d", a[i]);
      }
      printf("\n");
      printf("2 0 %d\n", a[1]);
    }
  } else {
    if (a[n - 1] > 0) {
      printf("1 %d\n", a[0]);
      printf("%d", n - 2);
      for (int i = 1; i < n; i++) {
        if (a[i] == 0) continue;
        printf(" %d", a[i]);
      }
      printf("\n");
      printf("1 0\n");
    } else {
      printf("1 %d\n", a[0]);
      printf("%d", n - 2);
      for (int i = 1; i < n - 1; i++) {
        printf(" %d", a[i]);
      }
      printf("\n");
      printf("1 0\n");
    }
  }
  return 0;
}
