Help with CHFNSWPS

Chefina and Swaps
https://www.codechef.com/JULY20B/problems/CHFNSWPS
I need to understand what will be the answer if the input was:
A => 4 5 5
B=> 3 3 4
According to the solution the answer is 3 but I don’t understand exactly how this happens?
I think i have misunderstood the question, any help will be appreciated.

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the answer for your Test Case A => 4 5 5 , B=> 3 3 4 will be 3 because, we can swap the pair {3,5} to get A => 4 3 5 and B=> 3 5 4 so that when A and B are sorted they are equal.

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Oh so i can sort at any moment? I thought I could do only once.
Thank You!

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