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

SOLUTION: gSFWBl

PROBLEM: BUvWkxrAvDQG, rHrkxrAkCE

SOLUTION: kxrA

PROBLEM: Yosjys, QwsjuZ

SOLUTION:
sj