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

[Q]: OVZxWYzAAxG, rStOxWYzJeoC
[A]: xWYz


[Q]: MSxTzCpiJAplpzSvLlNJS, oScCpiJAplpNVrqkn
[A]: CpiJAplp


[Q]: ulHUeHETpWQDIOyQHjrTSh, eMqWQUJHETpWQDIOyhPkxHP
[A]:
HETpWQDIOy