Array

2000ms

262144K

Description:

Vitaly has an array of n distinct integers. Vitaly wants to divide this array into three non-empty sets so as the following conditions hold:

The product of all numbers in the first set is less than zero ( < 0).
The product of all numbers in the second set is greater than zero ( > 0).
The product of all numbers in the third set is equal to zero.
Each number from the initial array must occur in exactly one set.

Help Vitaly. Divide the given array.

Input:

The first line of the input contains integer n (3 ≤ n ≤ 100). The second line contains n space-separated distinct integers a₁, a₂, ..., a_n (|a_i| ≤ 10³) — the array elements.

Output:

In the first line print integer n₁ (n₁ > 0) — the number of elements in the first set. Then print n₁ numbers — the elements that got to the first set.

In the next line print integer n₂ (n₂ > 0) — the number of elements in the second set. Then print n₂ numbers — the elements that got to the second set.

In the next line print integer n₃ (n₃ > 0) — the number of elements in the third set. Then print n₃ numbers — the elements that got to the third set.

The printed sets must meet the described conditions. It is guaranteed that the solution exists. If there are several solutions, you are allowed to print any of them.

Sample Input:

3
-1 2 0

Sample Output:

1 -1
1 2
1 0

Sample Input:

4
-1 -2 -3 0

Sample Output:

1 -1
2 -3 -2
1 0

Informação

Provedor Codeforces

Código CF300A