instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
IVnbnqBqdPcXfHotUzCYoaGQy, PAlyypBRRBqdPcXfHotpZs
answer:
BqdPcXfHot


question:
DhhYhrqVMXSoyvXQwqPKzWARAP, CaMXSoyvXQwqcDDtMsVqD
answer:
MXSoyvXQwq


question:
HiCLKKmEkzdJ, szzKKmEfsuu
answer:

KKmE