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

Q: XSnVeAjWLFWTgwmf, WsByLAjWLFWnQfl

A: AjWLFW
****
Q: NUuLSmDjCKcJPc, lGGSLIDjCKcJBo

A: DjCKcJ
****
Q: keyotygnJwyUmLqAUGvtUPQL, cgWDCTEnJwyUmLqAUTuOb

A:
nJwyUmLqAU
****