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

[Q]: YlhtTQgHiffTbIbBrcHMqFKCdWz, HyregFgMffTbIbBrcHYUnnQvGlx
[A]: ffTbIbBrcH


[Q]: sUdaWtsiRgqAYHykrHwjyDvZgD, MJdFXYiRgqAYHykrakSGHMr
[A]: iRgqAYHykr


[Q]: TTNkmaAbBoqqGVUv, NbPImaAbBoCHkhSJ
[A]:
maAbBo