In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
--------
Question: slTUxy, oqTUYa

Answer: TU


Question: ykDpbd, YFDpmO

Answer: Dp


Question: ScxbvLzqHNvKNd, IOqdTxbvLzqHNvuypfTnUY

Answer:
xbvLzqHNv