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

Q: plSfJAktMfac, TCjYJAktlt

A: JAkt
****
Q: iYuUgULgqcAgd, kRNUgULgqFv

A: UgULgq
****
Q: wVILih, MPILGr

A:
IL
****