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

SOLUTION: AHhdvH

PROBLEM: tftBHoDOYxCoTHVf, qhHoDOYxfUU

SOLUTION: HoDOYx

PROBLEM: KIrEThrN, UWgYrEThwD

SOLUTION:
rETh