instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
wNiHcaiUPHnjp, aSTmjcaiUPHFzOu
answer:
caiUPH


question:
IzwlZDJSEFPxfIud, xwWSYwlZDJSEFPbvSXTlS
answer:
wlZDJSEFP


question:
JlGejAa, cjGejhG
answer:

Gej