In this task, you are given two strings A, B. Find the longest common substring in the strings A and B.
--------
Question: OXdSmcKG, XbDdSmJl

Answer: dSm


Question: haOsaSQcyodWhqQaC, BKLEUQcyodWhvVkmxBz

Answer: QcyodWh


Question: XSindiEV, PenindidOs

Answer:
indi