instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
XmiLktrUjJDOCJ, UIKrUjJDOQsR
answer:
rUjJDO


question:
JAfPtjqqUYMD, cpXItjqqFN
answer:
tjqq


question:
monbJEYSExKG, NPJEYSav
answer:

JEYS