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:
SyweIt, ILweip
answer:
we


question:
YhcZBtgWcz, hPIRjZBtgWaOk
answer:

ZBtgW