Given two boxes of chocolate containing A and B chocolates representing the number of chocolates Alex and Drake have, respectively. Drake is the younger child and will only be happy if he receives a multiple of what Alex gets. You decided to buy some extra chocolates.

Mathematically, The share of chocolates will be:

k$*($A$+$X$)=($B$+$ Y$)$ for some non$-$negative integer X and Y and some positive integer k

What is the minimum number of extra chocolatesX$+$Y$)$ that you need to buy?

Note: The original chocolates $($A and B$)$ cannot be transferred among each other.

Function description

Complete the function solution. The function takes $2$ parameters and returns the solution:

A: Represents the number of initial chocolates in Alex's box

B$.$ Represents the number of Initial chocolates in Drake's box

Input format for custom testing

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