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

SOLUTION: lBjKv

PROBLEM: EJZYVxgFxPoOSDlLfK, uTLTIETHZYVxgFxPoPwr

SOLUTION: ZYVxgFxPo

PROBLEM: dXgVpNvHEPXrEcgxO, xJzXKVpNvHEPHrdqK

SOLUTION:
VpNvHEP