Given 2 sorted arrays **A** and **B** of size **N** each. Print sum of middle elements of the array obtained after merging the given arrays.

**Input:**

The first line contains T denoting the number of testcases. Then follows description of testcases.

Each case begins with a single positive integer **N** denoting the size of array. The second line contains the N space separated positive integers denoting the elements of array A. The third line contains N space separated positive integers denoting the elements of array B.

**Output:**

For each testcase, print the sum of middle elements of two sorted arrays. The number of the elements in the merged array are even so there will be 2 numbers in the center n/2 and n/2 +1. You have to print their sum.

**Constraints:**

1 <= T <= 50

1 <= N <= 10^{3}

1 <= A[i] <= 10^{6}

1 <= B[i] <= 10^{6}

**Example:**

**Input :**

1

5

1 2 4 6 10

4 5 6 9 12

**Output : **

11

**Explanation:**

**Testcase 1:** After merging two arrays, sum of middle elements is 11 (5 + 6).

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