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

[Q]: STvKOHq, XMGvKOdyM
[A]: vKO


[Q]: jJjsASFfCqVV, AkjsASFfBFwPy
[A]: jsASFf


[Q]: cytsjCeJEk, XIOoFvtsjCeJxPbkw
[A]:
tsjCeJ