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

BmxgSFWBlVX, kGgKrgSFWBlGunFcZ
gSFWBl

ljwjMioOwfOltGBaE, TneNGsoOwfOlxnWWW
oOwfOl

UEroLcIhaIgxCdHRS, yTKKsIhaIgxCjbvOdR

IhaIgxC

