In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.

[EX Q]: nTAXUw, OWAXYU
[EX A]: AX

[EX Q]: biAihydBoNlzR, IAloNhydBolwUz
[EX A]: hydBo

[EX Q]: QlnjINiiDMS, VaETRjINiiptqV
[EX A]:
jINii