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

[Q]: HqaOvLaZbs, RifOvLaZkh
[A]: OvLaZ


[Q]: eJPZzg, lFPZbI
[A]: PZ


[Q]: jvZmYmcJJQqSQSuGVVewQoFTiFm, zLpnUwPnPqSQSuGVVewtfQAgA
[A]:
qSQSuGVVew