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

[Q]: ljwjMioOwfOltGBaE, TneNGsoOwfOlxnWWW
[A]: oOwfOl


[Q]: ohueEOjHvAuoFVmMFft, ovdJPqOjHvAuoFVGbvxzlnE
[A]: OjHvAuoFV


[Q]: ftDsXRq, rYXDsXNr
[A]:
DsX