instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
YcgVJVACcQE, JsJVACcSz
answer:
JVACc

question:
VRamNL, mUamIB
answer:
am

question:
xwJJjpSFmYwkIpfoHFG, htuQjpSFmYwkIxVDYhQgqW
answer:
jpSFmYwkI