instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
vFuggVITQuctFG, hdCIWWuuggVITQwr
answer:
uggVITQ


question:
SIIPePlrkftKkzfgdjg, JqNnXHrkftKkzOMUwmc
answer:
rkftKkz


question:
vVOwGWJHWeaWjugLu, wuIQROwGWJHWeavyb
answer:

OwGWJHWea