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

[EX Q]: MSxTzCpiJAplpzSvLlNJS, oScCpiJAplpNVrqkn
[EX A]: CpiJAplp

[EX Q]: jAinxmaQUrmu, jqeEnxmaQUrWlrEqW
[EX A]: nxmaQUr

[EX Q]: IgVOurCfslqZYiFbbOgWp, AZIaRvjodfslqZYiFbHpxSozU
[EX A]:
fslqZYiFb