Given two arrays of A and B respectively of sizes N_{1} and N_{2}, the task is to calculate the product of maximum element of first array and minimum element of second array.

Input:
The first line of the input contains a single integer T, denoting the number of test cases. Then T test case follows. Each testcase contains 4 lines. First line contains size of the first array N_{1}, next line contains elements of the first array separated by spaces. Third line contains size of the second array N_{2} and next line contains elements of the second array separated by spaces.

Output:
For each testcase, output the product of the max element of the first array and the minimum element of the second array.

Explanation: Testcase 1: The first array is 5 7 9 3 6 2. The max element among these elements is 9. The second array is 1 2 6 -1 0 9. The min element among these elements is -1. The product of 9 and -1 is 9*-1=-9.