instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
kUoqCMPFTqGE, guoqCMPkwJs
answer:
oqCMP


question:
MSxTzCpiJAplpzSvLlNJS, oScCpiJAplpNVrqkn
answer:
CpiJAplp


question:
spUbdWDLWCeqr, vIuHkWDLWCQEPaz
answer:

WDLWC