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

SOLUTION: hydBo

PROBLEM: EPUxsZtt, KgxsZuXM

SOLUTION: xsZ

PROBLEM: EoFVRlrHYqHzNzlrSZgmT, XYFVRlrHYqHzCBBefQosC

SOLUTION:
FVRlrHYqHz