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

SOLUTION: GrqcrOBgG

PROBLEM: MSxTzCpiJAplpzSvLlNJS, oScCpiJAplpNVrqkn

SOLUTION: CpiJAplp

PROBLEM: RsHFYxpMTXod, WTYxpMSgHt

SOLUTION:
YxpM