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: yRhCObvPZYoKUoQnyaatR, NHzLJYPZYoKUoQnJnIsZxC

A: PZYoKUoQn
****
Q: DxuGmOBLzw, egImOBLcdM

A:
mOBL
****