instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
YCAyruPTTHWhCYaiXfIl, OETdzqAyruPTTHWgS
answer:
AyruPTTHW


question:
XpFCxFOgTTNCnQzMnVPV, FMqzdOwgTTNCnQzedorxVPe
answer:
gTTNCnQz


question:
WBhtotcyiNKCRwoU, qevBIxTcyiNKCRoT
answer:

cyiNKCR