Given two polynomial numbers represented by a linked list. The task is to complete the  function addPolynomial() that adds these lists meaning adds the coefficients who have same variable powers.

Input:
The first line of input contains an integer T denoting the number of test cases. Then in the next line is an integer N denoting the number of terms of first polynomial. In the next line are N space separated pairs x and y where x denotes the coefficient and y denotes the power. Similarly In the next line is an integer M denoting the no of terms of the second polynomial and in the line following it are N space separated pairs for second polynomial.

Output:
For each test case in a new line print the required polynomial in decreasing order of the power.

User Task:
The task is to complete the function addPolynomial() which should add the polynomial with same powers.

Constraints:
1 <= T <= 100
1 <= N, M <= 10⁵
1 <= x, y <= 10⁶

Example:
Input:
2
1
1 2
1
1 3
2
1 3 2 2
2
3 3 4 2
Output:
1x^3 + 1x^2
4x^3 + 6x^2

Explanation:
Testcase 1: Since, x² and x³ both have different powers as 2 and 3. So, their coefficient can't be added up.

Testcase 2: Since, x³ has two different coefficients as 3 and 1. Adding them up will lead to 4x³. Also, x² has two coefficients as 4 and 2. So, adding them up will give 6x².
 

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