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]: cvZfWOwa, xOfWOhZs
[A]: fWO


[Q]: hWSCiWVLaHqnma, pBiWVLaHNyq
[A]:
iWVLaH