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

[Q]: wNiHcaiUPHnjp, aSTmjcaiUPHFzOu
[A]: caiUPH


[Q]: bOvlVNWf, iivlVzWt
[A]: vlV


[Q]: jpdelLlRHEITsjmB, gqwelLlRHEBqgwN
[A]:
elLlRHE