In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.

Q: RAmKlEAUfWcgF, ZlWfEAUfWvVRa

A: EAUfW
****
Q: yjoJzBGdwfOhsceoOpoap, uSLMdBGdwfOhsIQHBijd

A: BGdwfOhs
****
Q: yOqkHD, dzqkJs

A:
qk
****