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

Q: xfZYYDKEqoRRu, ztCeYYDKEqoPG

A: YYDKEqo
****
Q: PivhPfah, XSghPfOi

A: hPf
****
Q: VvenPdlcKfzS, bUYoPdlcKnXZ

A:
PdlcK
****