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

SOLUTION: JmzrOTd

PROBLEM: PShMbsbexXGlpBuMMDZZS, sVqGxSexXGlpBxuHXoI

SOLUTION: exXGlpB

PROBLEM: XBDhULdd, WMzDhUZG

SOLUTION:
DhU