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

Q: ZGkBNEDRAwURXnxBIOJkzTvg, HMAwURXnxBMfGbPOBf

A: AwURXnxB
****
Q: oWwqraAz, uxTqraonu

A: qra
****
Q: jJjsASFfCqVV, AkjsASFfBFwPy

A:
jsASFf
****