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

wbFDXJQDQxQJzudOUlR, QEbsIDXJQDQxQsSYIutwU
DXJQDQxQ

pqFpUjQGiofBOjfYkRW, pQMnCFlhFpUjQGiofbc
FpUjQGiof

LfqwUl, HEqwOb

qw