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]: dsngGP, KvnglB
[A]: ng


[Q]: QNmjNcJweuXeIkB, rhlzcJweuEIExf
[A]:
cJweu