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

[Q]: LeHzcEFc, WFzcExvJ
[A]: zcE


[Q]: QEEVsnbQIgrxaZmflaZ, dPSbljkdQIgrxaZmgVzMT
[A]: QIgrxaZm


[Q]: WUiKfTkdgLFJpmYDWbZdA, FOnDRgLFJpmYDCpC
[A]:
gLFJpmYD