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

eFUexDIFlaPDUwrOb, mTvkKGUxDIFlaPDUwxGVpnIwbi
xDIFlaPDUw

sEYtoQlG, XIstoQQPw
toQ

PidywbBwvJOcxFt, xAGsywbBwvJBapB

ywbBwvJ