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

[Q]: YCAyruPTTHWhCYaiXfIl, OETdzqAyruPTTHWgS
[A]: AyruPTTHW


[Q]: VByrCcgcxCfPGDFqIWGloQZTMQf, OqfPGDFqIWGlalTCCkKkMf
[A]: fPGDFqIWGl


[Q]: avyFTE, htyFNe
[A]:
yF