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

[Q]: ocjsZZfSBBopDtgWUT, rWmgzsZZfSBBoGWQ
[A]: sZZfSBBo


[Q]: wLLwjL, arLwXm
[A]: Lw


[Q]: LdOIOjuiwZIyiDHXgSypyY, AjElwZIyiDHXFGFjtIXU
[A]:
wZIyiDHX