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

[Q]: sEYtoQlG, XIstoQQPw
[A]: toQ


[Q]: lQwpMQRxuVbJDv, UkzwpMQRxuDVT
[A]: wpMQRxu


[Q]: daaUPWAnPeywSotOWAip, BCKfsnPeywSotxXLslRN
[A]:
nPeywSot