instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
ZGkBNEDRAwURXnxBIOJkzTvg, HMAwURXnxBMfGbPOBf
answer:
AwURXnxB

question:
dmigbcBoWdAIyaeE, zXiKQFbcBoWdAIyaEypIjJpwbU
answer:
bcBoWdAIya

question:
bSfYLJzcEdhOnSFeWnkpaP, EkKrOEgIEdhOnSFeIkaSE
answer:
EdhOnSFe