instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
YHLJZrFQ, aSLJZQuo
answer:
LJZ


question:
zbSNNVc, agSNNtOQ
answer:
SNN


question:
SJQgwRJNauDikLiZAQUVP, DGasMVuuDikLiZAQcMQJm
answer:

uDikLiZAQ