instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
HHJAHyvNCGmJEljWrjvHOqf, msPVEbNCGmJEljsKRX
answer:
NCGmJElj


question:
OjQHcFUCflYUptUPqYKVomn, GXHcFUCflYUpSSTrQ
answer:
HcFUCflYUp


question:
ATjETW, cMjEon
answer:

jE