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: SyweIt, ILweip

A: we
****
Q: TUAHhdvHIBxogI, LjfGsAHhdvHJcSdNV

A:
AHhdvH
****