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

Q: vMYfFo, EHYfnP

A: Yf
****
Q: wcJmSloqlddFOfv, szhUIAqzSloqlddFDJz

A: SloqlddF
****
Q: GyNYhKKAaIBPHNAjZlFHSfk, vfOAaIBPHNAjtleOVtIYY

A:
AaIBPHNAj
****