instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
jAinxmaQUrmu, jqeEnxmaQUrWlrEqW
answer:
nxmaQUr


question:
OVVkkdeHoFlyNROyCP, zFVUJbvkkdeHoFlysF
answer:
kkdeHoFly


question:
gEHypKvgWMojaohwDv, xbKvgWMojaohAtmI
answer:

KvgWMojaoh