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

SOLUTION: zcE

PROBLEM: YCAyruPTTHWhCYaiXfIl, OETdzqAyruPTTHWgS

SOLUTION: AyruPTTHW

PROBLEM: BXsTzYJs, TNsTzgPc

SOLUTION:
sTz