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

SOLUTION: bAgSV

PROBLEM: ZRjPgqbLL, uIsmPgqbBB

SOLUTION: Pgqb

PROBLEM: xaikeXDlAo, AyANikeXDGS

SOLUTION:
ikeXD