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

SOLUTION: mRXDUuU

PROBLEM: WFAPUCgVYbmZiFlacUzyv, xQFiekrgPUCgVYbmZUEtl

SOLUTION: PUCgVYbmZ

PROBLEM: MlkIPAPq, XxAkIPAhkdT

SOLUTION:
kIPA