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

[Q]: iYSNsY, HSSNhP
[A]: SN


[Q]: mQvintdwLUpClREgxv, rYnoXBtdwLUpClRwxsqX
[A]: tdwLUpClR


[Q]: NfPhJTHn, QFihJTvR
[A]:
hJT