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

[Q]: BICndZkjoSidWivWATvtqsS, FzVWjoSidWivFaQhkRT
[A]: joSidWiv


[Q]: HKCoXQsLRtowYJ, PGRzNUQsLRtoLcqkn
[A]: QsLRto


[Q]: aWOczXStixtgYgu, eBAfJStixtgYxtpi
[A]:
StixtgY