instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
hcmMoVBhK, mdmMoVBjuT
answer:
mMoVB


question:
eMDNXl, ZZDNAa
answer:
DN


question:
RpaZAvSnEBgGapIPQgw, wcwYsXvSnEBgGapIwoIWROB
answer:

vSnEBgGapI