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

[Q]: RGImMTISYdkjzMO, pmyfpImMTISYdatLBBFr
[A]: ImMTISYd


[Q]: ylyLVUjsmMrXMFAPDGIZsHq, cYymMrXMFAPjm
[A]: mMrXMFAP


[Q]: mvIvSzMtYsfVLdaGEmef, wnzMtYsfVLdaKm
[A]:
zMtYsfVLda