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

[Q]: VByrCcgcxCfPGDFqIWGloQZTMQf, OqfPGDFqIWGlalTCCkKkMf
[A]: fPGDFqIWGl


[Q]: bmZKWkYPqugcvzbHykblPzQLhK, tPUzKqugcvzbHypzk
[A]: qugcvzbHy


[Q]: UWyMXIBAZoCvArXQ, TdNqXqBAZoCvHBtSxa
[A]:
BAZoCv