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

[Q]: oDdulHNcCdgbRGxiBTxM, kDcCdgbRGnsJlvas
[A]: cCdgbRG


[Q]: RAmKlEAUfWcgF, ZlWfEAUfWvVRa
[A]: EAUfW


[Q]: aYlWyuceX, GfFWOlWyucTByng
[A]:
lWyuc