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

[Q]: WFAPUCgVYbmZiFlacUzyv, xQFiekrgPUCgVYbmZUEtl
[A]: PUCgVYbmZ


[Q]: zmbmQuyNGOe, mUMEmQuyiuS
[A]: mQuy


[Q]: dHujgCLgmyumKVSFHiSDKbm, OfgmyumKVSuIouOFE
[A]:
gmyumKVS