instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
osmJJcZlDAXBgJFsJKa, rzPNlDAXBgJYrgXlH
answer:
lDAXBgJ


question:
QKlzsmHyBcC, snPtzsmHdMIv
answer:
zsmH


question:
hwsNriAV, tCnsNrJZ
answer:

sNr