instruction:
In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
question:
nWTnWqkLqYTBxT, cSTnWqkLqYwXmxRF
answer:
TnWqkLqY


question:
rEHxRBOktYreNkK, NCOktYreFFCFwi
answer:
OktYre


question:
tWJoKSOAuVhmsomA, emdmnBFJoKSOAuVzSgW
answer:

JoKSOAuV