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

[Q]: pqFpUjQGiofBOjfYkRW, pQMnCFlhFpUjQGiofbc
[A]: FpUjQGiof


[Q]: wLLwjL, arLwXm
[A]: Lw


[Q]: dMXOuoKVxVXXIuu, aEHKVxVXXPvsAT
[A]:
KVxVXX