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

pqFpUjQGiofBOjfYkRW, pQMnCFlhFpUjQGiofbc
FpUjQGiof

sdGIVJPsWWszKPCGk, ghRJPsWWszKcJUg
JPsWWszK

zuvXlRUIi, nxAXlRfJI

XlR