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

[Q]: HKqfdEvqDuGhWByFlzIEeYh, VVaZfkLCMuGhWByFlzIOZaXbMCA
[A]: uGhWByFlzI


[Q]: VeLJEBYpZwxVQlo, EZEBYpZwxVQIxjFj
[A]: EBYpZwxVQ


[Q]: yCmlKZSxYKwjAvO, nmmRSxYKwjOJHAj
[A]:
SxYKwj