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

SOLUTION: NgaUu

PROBLEM: WFAPUCgVYbmZiFlacUzyv, xQFiekrgPUCgVYbmZUEtl

SOLUTION: PUCgVYbmZ

PROBLEM: jhcBaxuxFgfqXrywbiOATsKCppA, wpcgfqXrywbiOMXHuHaiKV

SOLUTION:
gfqXrywbiO