TASK DEFINITION: In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
PROBLEM: WlqGjLNrxXeUrKCZel, pDSsmNrxXeUrKCslBXBbRu

SOLUTION: NrxXeUrKC

PROBLEM: IGHhMfqLeBpnullsPInfBH, LTDBpnullsPIBynwCrCQ

SOLUTION: BpnullsPI

PROBLEM: HhbZfWsjADLu, ylfWsjhh

SOLUTION:
fWsj