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

SOLUTION: oJ

PROBLEM: jsXHot, gtXHmB

SOLUTION: XH

PROBLEM: jXqEDHTCxTiUAICWZJdpmYq, GBTCxTiUAICZKnLgZBXi

SOLUTION:
TCxTiUAIC