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

SOLUTION: mELarB

PROBLEM: XEvxzelZaWRO, zXIelZaWBUn

SOLUTION: elZaW

PROBLEM: nwODBSIkczUp, xOODBSIkzllyG

SOLUTION:
ODBSIk