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

SOLUTION: HBJehHt

PROBLEM: TvNVpHLPYjBCeUpyxlzFZ, tgKdPKVYjBCeUpyPK

SOLUTION: YjBCeUpy

PROBLEM: cELiRETsbMwydItTAN, uZBLiRETsbMTObV

SOLUTION:
LiRETsbM