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

[Q]: nxoXDohHr, WcbkXDohFbJ
[A]: XDoh


[Q]: CzkPtkpMTDeNZwCPbJJn, HzpMVDeNZwCPbJVOU
[A]: DeNZwCPbJ


[Q]: QXWFFqGxTlTIJSRDQdKqkzfy, XziRFFuPlTIJSRDQdedTNiqElR
[A]:
lTIJSRDQd