instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
pYmzRnGPQVPrqPApKTyvaO, tNGPQVPrqPVTh
answer:
GPQVPrqP


question:
vISTrmBMpQyanUTSXUCm, dJGyOHMpQyanUTpSb
answer:
MpQyanUT


question:
wlQfKjehdrGc, rwKjehSLlc
answer:

Kjeh