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

SOLUTION: veGzFUim

PROBLEM: tGBRASi, QABRAtL

SOLUTION: BRA

PROBLEM: qsWSPnYPNjUfoXxM, GuqizjMIFwPnYPNjUfoXixgzuapGIQ

SOLUTION:
PnYPNjUfoX