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

Q: CMrTXnTnTVaR, srnXnTnTDNULO

A: XnTnT
****
Q: XYnCjAWPHHJ, gmCjAWPHpmwVsm

A: CjAWPH
****
Q: jdLbZSCzaAHGbNwILGmudOH, RdIPuEYJvUZSCzaAHGbNduLToRC

A:
ZSCzaAHGbN
****