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

[Q]: uqDaPS, XyDaMZ
[A]: Da


[Q]: ilgSzrcUKLTNLJbMKMKSt, hFXIuUKLTNLJbMKWxSCkDjY
[A]: UKLTNLJbMK


[Q]: QEHvsEkhZQrc, yqusEkhZVb
[A]:
sEkhZ