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

SOLUTION: Lyg

PROBLEM: jyJrDIhxJtWbnooEXZ, uyXifNCIhxJtWbnVCUrt

SOLUTION: IhxJtWbn

PROBLEM: eCDiQpHV, ZRODiQpiF

SOLUTION:
DiQp