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

SOLUTION: MXSoyvXQwq

PROBLEM: BICndZkjoSidWivWATvtqsS, FzVWjoSidWivFaQhkRT

SOLUTION: joSidWiv

PROBLEM: KKrCLvJKRoyV, WDeLvJKCBdS

SOLUTION:
LvJK