Find the Duplicates

Sometimes you need to compare lists of number, but sorting each one normally will take too much time. Instead you can use alternative methods to find the differences between each list. Try to find a faster way to do this challenge than sorting two entire lists.

Challenge
Numeros The Artist was arranging two identical lists of numbers A and B into specific orders. While it seemed like two random arrangements to everyone else, Numeros was very proud of his arrangements. Unfortunately, some numbers got left out of List A. Can you find the missing numbers from A without messing up his order?

Details
There are many duplicates in each list, but you need to find the extra numbers in B that remain once all the AB "matches" have been found. The numbers are all within a range of 100 from each other.

Guideline
Don't sort the lists to solve this problem. In fact, you can solve it with one pass through each of the lists.

Input
The first line will contain T, the number of test cases. Each test case will contain
four lines of input:

n - the size of the first list
This is followed by n numbers that makes up the first list.
m - the size of the second list
This is followed by m numbers that makes up the second list.

Sample Input

1
2
10
203 204 205 206 207 208 203 204 205 206
13
203 204 204 205 206 207 205 208 203 206 204 205 206

Sample Output

204 205 206

These numbers are extra in the 2^nd list. Note each list can be in any order and the extra numbers can appear anywhere in the list.

Note
The boilerplate code needs to be modified so you can get both lists of numbers in each case.