In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.

Q: tyVlHfTPLRSdFilXnSfqQ, bkTPLRSdFiMgXC

A: TPLRSdFi
****
Q: rEHxRBOktYreNkK, NCOktYreFFCFwi

A: OktYre
****
Q: velaXjrnMmlpdHyaDKNzwYrYH, qjtgthErnMmlpdHyaeXAoVKrNKx

A:
rnMmlpdHya
****