instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
xMxyohPBlJIEBqghiMdBQPwq, xsBlJIEBqghlMosK
answer:
BlJIEBqgh


question:
RinootTGLjbRGYznmBdH, oRMtTGLjbRGYzwEVHsjW
answer:
tTGLjbRGYz


question:
pBxvVshAEebw, UFpHHvVshAEBULa
answer:

vVshAE