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

Q: SIIPePlrkftKkzfgdjg, JqNnXHrkftKkzOMUwmc

A: rkftKkz
****
Q: MSxTzCpiJAplpzSvLlNJS, oScCpiJAplpNVrqkn

A: CpiJAplp
****
Q: wgexuEgctEnSP, pTKsuEgctTOri

A:
uEgct
****