instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
HorIyjpfBFmKZQUIEoP, AcWOaOgVPmyjpfBFmKZQPFYiI
answer:
yjpfBFmKZQ


question:
rEHxRBOktYreNkK, NCOktYreFFCFwi
answer:
OktYre


question:
obmMkOoLkOOXJPHZjABoX, cCSOoLkOOXJwnhnHk
answer:

OoLkOOXJ