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

SOLUTION: jNchdK

PROBLEM: rlBoVyFsYqpmmQmelGBg, iKKaIyFsYqpmmWcrKn

SOLUTION: yFsYqpmm

PROBLEM: XmPuYdYKJ, qYzuYdYtW

SOLUTION:
uYdY