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

[Q]: oHoJrr, YAoJSq
[A]: oJ


[Q]: AedXEOrEgvnzF, TVTEOrEgvxKuJgv
[A]: EOrEgv


[Q]: rCBMbDCXEVphS, tZseBMbDCXEGefv
[A]:
BMbDCXE