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

SOLUTION: MimvyQP

PROBLEM: FCKbAgSVgj, wAEAWbAgSVSVwD

SOLUTION: bAgSV

PROBLEM: IDdsdIWXEauDXcDsB, NYsvkkSdsdIWXEauDlAONSX

SOLUTION:
dsdIWXEauD