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

[Q]: kOrQWjLKnwN, xFsWjLKgr
[A]: WjLK


[Q]: oKZCAErEMqzODnkcNqxVdoBOC, yHzRJuSqzODnkcNqxExr
[A]: qzODnkcNqx


[Q]: pxajVB, LcajCz
[A]:
aj