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

SOLUTION: xWYz

PROBLEM: oiNEYHxbvAb, bcDDdEYHxbCREd

SOLUTION: EYHxb

PROBLEM: XQJLQcnts, JtwLQcEqn

SOLUTION:
LQc