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

Q: PivhPfah, XSghPfOi

A: hPf
****
Q: yKtQOhYvrJVH, HQsTQOhYvPP

A: QOhYv
****
Q: JCQirdJlsJV, mqirdJlYpcI

A:
irdJl
****