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

Q: libDFDxIgRiglWfxMVRr, yMltDxIgRiglpms

A: DxIgRigl
****
Q: lkFGXvTkKm, wwELXvTkcOnG

A: XvTk
****
Q: ojbQatqVLiQ, xvCpatqVLEvDz

A:
atqVL
****