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

[Q]: zfUPUDeKbCMQa, BkAJFJUDeKbCMZmkFu
[A]: UDeKbCM


[Q]: yKtQOhYvrJVH, HQsTQOhYvPP
[A]: QOhYv


[Q]: ThCrPenVeSMZZHdOOitUXYhY, ZoeMZZHdOOitUEAfTZPE
[A]:
MZZHdOOitU