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

[Q]: IIbJjQKWaoGKHGgWPcy, uNoMWaoGKHGqbnjmYQ
[A]: WaoGKHG


[Q]: kvutZfcPKzHE, kTKutZfcPTGmU
[A]: utZfcP


[Q]: MDBWFljAJgKucrQPv, CrsMhUDDLRFljAJgKucrEo
[A]:
FljAJgKucr