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

Q: FNVeaFmprNHqqtAaKv, iGBmrrMveaFmprNHqWWAvtht

A: eaFmprNHq
****
Q: YCAyruPTTHWhCYaiXfIl, OETdzqAyruPTTHWgS

A: AyruPTTHW
****
Q: BEbAwCSHDWbFFVe, wefFRCSHDWbKA

A:
CSHDWb
****