Find duplicates in an array
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Given an array A[], Your task is to complete the function printDuplicates which prints the duplicate elements of the given array. If no duplicate element is found  print -1.

Note: Auxiliary Space must be O(1) and Time complexity must be O(n).

Input:
The first line of input contains an integer T denoting the no of test cases. Then T test cases follow. Each test case contains an integer N which denotes number of elements of Array. Second line of each test case contains N space separated integers denoting elements of Array A[].

Output:
Print the duplicate elements from the array.The order of the output should be as the element found to be repeated.

Constraints:
1<=T<=100
1<=N<=50
0<=A[]

Example:
Input:
2
4
0 3 1 2
5
2 3 1 2 3
Output:
-1
2 3

#### ** For More Input/Output Examples Use 'Expected Output' option **

Contributor: Saksham Raj Seth
Author: saksham seth