instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
ZyrpGdXvvtrKQIxU, CLNGdXvvtrKQDpicfqLdt
answer:
GdXvvtrKQ


question:
YHLJZrFQ, aSLJZQuo
answer:
LJZ


question:
WjJvoYxdegJszyYrzloYL, WzjxdegJszyYrNoftRFH
answer:

xdegJszyYr