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

SOLUTION: PZ

PROBLEM: ilgSzrcUKLTNLJbMKMKSt, hFXIuUKLTNLJbMKWxSCkDjY

SOLUTION: UKLTNLJbMK

PROBLEM: WjQmTCZJnAYecHCztsEd, OtIoJnAYecHCwcN

SOLUTION:
JnAYecHC