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

[Q]: FiKGCRXutEOzMqP, xdxRXutEsl
[A]: RXutE


[Q]: fCGEhfHvcRouHzNw, gtjBkhfHvcRouHee
[A]: hfHvcRouH


[Q]: xNtwYrWrLAldyGrZhWw, XVqFCnjPrrWrLAldyGKElD
[A]:
rWrLAldyG