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

Q: bdCOjNchdKtvWzOI, FwejNchdKhEd

A: jNchdK
****
Q: PIcbiJj, hedcbiZHF

A: cbi
****
Q: RNbIwAtodSQMuC, hgBlAtodSIUpW

A:
AtodS
****