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

Q: GnElFKBIoYmAdvz, GrElFKBIoMo

A: ElFKBIo
****
Q: VutZiVkDQcVpQO, BDQVDyBdiVkDQcVpuvNN

A: iVkDQcVp
****
Q: TLsolqQUo, MSolqaHE

A:
olq
****