instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
XpFCxFOgTTNCnQzMnVPV, FMqzdOwgTTNCnQzedorxVPe
answer:
gTTNCnQz


question:
WlqGjLNrxXeUrKCZel, pDSsmNrxXeUrKCslBXBbRu
answer:
NrxXeUrKC


question:
XfHxgBDwIHzWVgfirqeIJ, KGdYwIHzWVgfJGQWuCp
answer:

wIHzWVgf