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

Q: PIcbiJj, hedcbiZHF

A: cbi
****
Q: RwqzMTeLMdPx, qaWtYhqzMTeLMdHbWDT

A: qzMTeLMd
****
Q: lgoFGBYoOvagzSgHVsR, cmAimkechFGBYoOvagTahetJs

A:
FGBYoOvag
****