instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
biAihydBoNlzR, IAloNhydBolwUz
answer:
hydBo


question:
jinzsW, SMnzaW
answer:
nz


question:
ihAhOENrZDAQphffP, awXAhOENrZDES
answer:

AhOENrZD