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

Answer: tdwLUpClR


Question: sRTQgRgRUjEooapKdR, vzsBgRUjEooLBkYeH

Answer: gRUjEoo


Question: dJnXkldHTdyZetuKKLvrRo, plkldHTdyZetVXsSpnxPQ

Answer:
kldHTdyZet