In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.

FSwxBJ, iTwxAa
wx

WFAPUCgVYbmZiFlacUzyv, xQFiekrgPUCgVYbmZUEtl
PUCgVYbmZ

IcedqWYRrYE, MpTqWYRrFNPTz

qWYRr