instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
YPeBvuJXaSLLPhKpUQ, ryjPdyuJXaSLLPhIzBeJP
answer:
uJXaSLLPh


question:
PzXzvmYrlGZgOBk, iKnzvmYrlGZgOrs
answer:
zvmYrlGZgO


question:
wkVVZREWhcSCpvCTB, ZQWhcSCpvCDVUY
answer:

WhcSCpvC