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

[Q]: uqazNuZhdJhw, KbnrzNuZhBdp
[A]: zNuZh


[Q]: jJSSBmflUyrEMLjSycA, YkmujkSSBmflUyrKKJZ
[A]: SSBmflUyr


[Q]: AFrQeuIoa, zrZprQeuNnS
[A]:
rQeu