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

[Q]: DnAzbgMtdPKsNCMpBfc, QdfXRkWREzbgMtdPKsGx
[A]: zbgMtdPKs


[Q]: ksRxEVrz, cOMRxEViwF
[A]: RxEV


[Q]: CVUYoOxnGWKhaTAn, ZCXSVoOxnGWTT
[A]:
oOxnGW