instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
ezVsFayUPcrte, lfsFayUMPTqx
answer:
sFayU


question:
YlhtTQgHiffTbIbBrcHMqFKCdWz, HyregFgMffTbIbBrcHYUnnQvGlx
answer:
ffTbIbBrcH


question:
jIxdtjTjlBhKRSFOIkWipebBD, ahAYjlBhKRSFORxnD
answer:

jlBhKRSFO