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

[EX Q]: UTdardKNThdYrGKMqZPeg, mvrThdYrGKMlcCxBtak
[EX A]: ThdYrGKM

[EX Q]: wbdHVigIkjNkuAmbr, iSgIkjNkQYyn
[EX A]: gIkjNk

[EX Q]: BZRpdx, mlRpyG
[EX A]:
Rp

