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

[Q]: jyJrDIhxJtWbnooEXZ, uyXifNCIhxJtWbnVCUrt
[A]: IhxJtWbn


[Q]: OFbCjZDoRRlLsMU, DcCjZDoRRtld
[A]: CjZDoRR


[Q]: uUkZKMUc, xvhkZKZB
[A]:
kZK