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:
uqDaPS, XyDaMZ
answer:
Da


question:
jSXIjIBlcMi, gJEIjIBTa
answer:

IjIB


