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

Q: IVnbnqBqdPcXfHotUzCYoaGQy, PAlyypBRRBqdPcXfHotpZs

A: BqdPcXfHot
****
Q: biAihydBoNlzR, IAloNhydBolwUz

A: hydBo
****
Q: CnQzUBAkEqC, RpOzUBAmX

A:
zUBA
****