instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
oGaGjsaKsUpLQAg, iDGjsaKsUoYGuta
answer:
GjsaKsU


question:
RpaZAvSnEBgGapIPQgw, wcwYsXvSnEBgGapIwoIWROB
answer:
vSnEBgGapI


question:
aSvMNECEVeLvWLVcwKdc, SAZOEVeLvWLdyemvr
answer:

EVeLvWL