Find the Duplicates

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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.

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?

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.

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