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

SOLUTION: gTTNCnQz

PROBLEM: vSFxjd, AHFxpi

SOLUTION: Fx

PROBLEM: UjsqEg, XFsqZF

SOLUTION:
sq