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

Q: VRamNL, mUamIB

A: am
****
Q: oiNEYHxbvAb, bcDDdEYHxbCREd

A: EYHxb
****
Q: GmnhWmaLTi, FRwhWmaFU

A:
hWma
****