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

Q: OFbCjZDoRRlLsMU, DcCjZDoRRtld

A: CjZDoRR
****
Q: KTAFonizDqCVvucpJWrItdw, rfFonizDqCVvYbGhb

A: FonizDqCVv
****
Q: niIrszWnDjrfGEhhqKY, DGPWnDjrfGvwSNN

A:
WnDjrfG
****