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

SOLUTION: gGqsXYl

PROBLEM: kWnjCoVmCSVuW, RILPKCoVmCSVbaOza

SOLUTION: CoVmCSV

PROBLEM: ASZmjErnU, rVZmjErHX

SOLUTION:
ZmjEr