instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
jJjsASFfCqVV, AkjsASFfBFwPy
answer:
jsASFf


question:
IJQqdzqdaGEIcdyh, izlVdzqdaGGiPYz
answer:
dzqdaG


question:
ctUIvTLvTXojhEpWDRAchqT, CczkSdJQTXojhEpWhPzJmTqe
answer:

TXojhEpW