instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
yywhNdZQkLSzbOvhluicHA, lfZQkLSzbOvhVC
answer:
ZQkLSzbOvh


question:
OhMVLbQhBxEaOZY, iDVLbQhBxBiiD
answer:
VLbQhBx


question:
GJePhxytBNoarHtA, gymxytBNobxaTA
answer:

xytBNo