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

[Q]: wDSKHtWbCDqTeoBeiYHdcZD, MydQCwqTeoBeiYHdYMp
[A]: qTeoBeiYHd


[Q]: NTINFnRckGsfLqhSoA, UUONcKKFnRckGsfLqVak
[A]: FnRckGsfLq


[Q]: lItnRlfdCo, fTcRlfdSJk
[A]:
Rlfd