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

Answer: uNemHG


Question: uGDJixAmSiVaFRmfKRM, NsTGxsJixAmSiVageSw

Answer: JixAmSiVa


Question: qyyVLlEriRvynJUP, ucCbYLlEriRvfLJMXpP

Answer:
LlEriRv