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

SOLUTION: WaoGKHG

PROBLEM: DQVkAbWTTPhoBx, TeWTTPhonxcIKL

SOLUTION: WTTPho

PROBLEM: acPGLbQCGqqXqjIIBjqMMFc, myzUWXMnzLbQCGqqXqjQzU

SOLUTION:
LbQCGqqXqj