instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
UldKHMpUYADGfEUGcSon, nPHMpUYADGfEKqHCLPmL
answer:
HMpUYADGfE


question:
AedXEOrEgvnzF, TVTEOrEgvxKuJgv
answer:
EOrEgv


question:
ZwsOtTeZqfJZi, UPsJDtTeZqfoMi
answer:

tTeZqf