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: CUlMsvov, iflMsSRp

A: lMs
****
Q: xLdMATwfcTAfpczyy, LRtTwfcTAuR

A:
TwfcTA
****
