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: yKtQOhYvrJVH, HQsTQOhYvPP

SOLUTION: QOhYv

PROBLEM: PyFyuWWbIXMFAZU, GSLuWWbIXMPCft

SOLUTION:
uWWbIXM