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

SOLUTION: WDLWC

PROBLEM: BmwpAnWJ, klVwpAFw

SOLUTION: wpA

PROBLEM: XYnCjAWPHHJ, gmCjAWPHpmwVsm

SOLUTION:
CjAWPH