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

Q: yOGvgtAmwMwcIRtJ, cQtAmwMwcIRjfjO

A: tAmwMwcIR
****
Q: uqDaPS, XyDaMZ

A: Da
****
Q: MrfHssFwelrsSUIAlPffp, PwHcgyFFsFwelrsSUPpxnk

A:
sFwelrsSU
****