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

Answer: JAkt


Question: IIbJjQKWaoGKHGgWPcy, uNoMWaoGKHGqbnjmYQ

Answer: WaoGKHG


Question: cZSEmdgP, YsSEmEIM

Answer:
SEm