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

Q: umXfmRnUgALpFAqBaKfNfo, aOAXWnUgALpFAqBmNpTCdj

A: nUgALpFAqB
****
Q: VXSNlHzkB, EoNlHCiL

A: NlH
****
Q: CTxViY, JMxVQr

A:
xV
****