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

oCtWZYdkvZ, pkktWZYdEHMW
tWZYd

pqFpUjQGiofBOjfYkRW, pQMnCFlhFpUjQGiofbc
FpUjQGiof

DZclDCrYwT, AYlDCrPCAT

lDCr