Equilibrium index of an array is an index such that the sum of elements at lower indexes is equal to the sum of elements at higher indexes . Now Given an array your task is to complete the function **findEquilibrium** which returns the index of the first Equilibrium point in the array. The function takes two arguments. The first argument is the array A[ ] and the second argument is the size of the array A.

**Input:**

The first line of input takes an integer T denoting the no of test cases, then T test cases follow. The first line of each test case is an integer N denoting The size of the array . Then in the next line are N space separated values of the array.

**Output:**

For each test case output will be the equilibrium index of the array .If no such index exist output will be -1.

**Constraints:**

1<=T<=100

1<=N<=100

-100<=A[]<=100

**Example(To be used only for expected output):
Input**

2

4

1 2 0 3

4

1 1 1 1

2

-1