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

[Q]: RNYHvcNnbsUdJLvS, PpNnbsUdglWhl
[A]: NnbsUd


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


[Q]: IIbJjQKWaoGKHGgWPcy, uNoMWaoGKHGqbnjmYQ
[A]:
WaoGKHG