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

[EX Q]: edjRAatlaiCmWkpqMh, qDZYVWCDTRAatlaiCmYH
[EX A]: RAatlaiCm

[EX Q]: VTwtMVKmrRvL, WLoVtWtMVKmrDCke
[EX A]: tMVKmr

[EX Q]: uUbYedHosNbtdM, wZYkdHosNZMSgg
[EX A]:
dHosN