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

Q: CwTYJWQbzEZkvcqKn, hBnhJWQbzEZkKmVM

A: JWQbzEZk
****
Q: RwqzMTeLMdPx, qaWtYhqzMTeLMdHbWDT

A: qzMTeLMd
****
Q: rkoFvjCysqarjeUSmim, ZKIfJHtRjCysqarjQmm

A:
jCysqarj
****