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

[Q]: VTwtMVKmrRvL, WLoVtWtMVKmrDCke
[A]: tMVKmr


[Q]: zeuyZKwvIOfx, BlmZKwvspUt
[A]: ZKwv


[Q]: uYvxmucGkclMirvQGQ, shGkclMirqIhQxYH
[A]:
GkclMir