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

[Q]: ZyrpGdXvvtrKQIxU, CLNGdXvvtrKQDpicfqLdt
[A]: GdXvvtrKQ


[Q]: aBlALASwuwTZmy, MdwASwuwIW
[A]: ASwuw


[Q]: UNHloidQDnOqpOAejTJlkp, FAYYDnOqpOAezQBS
[A]:
DnOqpOAe