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

[Q]: FiKGCRXutEOzMqP, xdxRXutEsl
[A]: RXutE


[Q]: aZcGMvzBhazkCIFqpVe, AOljBvzBhazkWXeTuA
[A]: vzBhazk


[Q]: LeBZJpHOhDaV, bSbHRpHOhDLHCc
[A]:
pHOhD