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

[Q]: HiGmCdXrmFRJYWLvZbpU, IxhkrmFRJYWLvZLaqRVxPkL
[A]: rmFRJYWLvZ


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


[Q]: vjjKOfU, aCJjKOviK
[A]:
jKO