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

SOLUTION: ImMTISYd

PROBLEM: QgkpBHsrfRYJCa, AdjbKLpBHsrfbpBC

SOLUTION: pBHsrf

PROBLEM: BsiUYXNRilrqlN, LEoNRilrqMaZ

SOLUTION:
NRilrq