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

Q: IzwlZDJSEFPxfIud, xwWSYwlZDJSEFPbvSXTlS

A: wlZDJSEFP
****
Q: OFbCjZDoRRlLsMU, DcCjZDoRRtld

A: CjZDoRR
****
Q: HProUoIOZCqb, qrLUoIOHBU

A:
UoIO
****