instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
DwLGzwYOWjtzIunE, TTViSbkwYOWjtzNqUOOz
answer:
wYOWjtz

question:
SQNzngllNbOkKDK, MijfNzngllNDfWge
answer:
NzngllN

question:
HXtDINnKeRZskP, flqINnKesHY
answer:
INnKe