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

SOLUTION: ZjIcpidm

PROBLEM: XeQwOS, OuQwNR

SOLUTION: Qw

PROBLEM: LQNijxELoDolPVGdgVLrkLNtlBDE, EhrMwzoDolPVGdgVeD

SOLUTION:
oDolPVGdgV