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

Q: CkZOSZevST, bbZOSZIg

A: ZOSZ
****
Q: mJoHBJehHtkFS, ZMrDxHBJehHtxS

A: HBJehHt
****
Q: hePlroRWRic, UBlroRWRRE

A:
lroRWR
****