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

[Q]: xeKSiBafhOWBbYwlGaQ, GUfIsKgafhOWBbYiFWnptAt
[A]: afhOWBbY


[Q]: SODsrWUjUBSgA, WIWUjUBCUUs
[A]: WUjUB


[Q]: obZjOnjheJzkNdeLq, YPYxjheJzkoVAg
[A]:
jheJzk