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

[Q]: MriFNpGM, yaiFNduk
[A]: iFN


[Q]: HqaOvLaZbs, RifOvLaZkh
[A]: OvLaZ


[Q]: DUhUbmfLuOFAQann, kwnzfLuOFAErR
[A]:
fLuOFA