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: NwmTIZSnlKGG, qAYIZSnfWRd

A: IZSn
****
Q: xgNVPFtEJ, RWVPFmKn

A:
VPF
****