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

[Q]: oDdulHNcCdgbRGxiBTxM, kDcCdgbRGnsJlvas
[A]: cCdgbRG


[Q]: vhZuXCsIkQR, YflCuXCsIkLu
[A]: uXCsIk


[Q]: AMxUxIXvVVjYSIloqZZEIlIwL, MzbVvVVjYSIloqsnnMR
[A]:
vVVjYSIloq