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

dxqZUOvRprXyFfjQfTWBhR, biSVjOvRprXyFfDtuFWQ
OvRprXyFf

NUuLSmDjCKcJPc, lGGSLIDjCKcJBo
DjCKcJ

pOItCuYJQQIfPr, JWmPJoUvRgItCuYJQQIfVzzAwcf

ItCuYJQQIf