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

[Q]: AxAmDG, LTAmEV
[A]: Am


[Q]: TdvkBvVyJcSdYGGPfnyml, rIvIvVyJcSdYhtxG
[A]: vVyJcSdY


[Q]: nUEwPKbmOTKLEGGyTxrvvuxVwf, fWqNduGbmOTKLEGGyXtMT
[A]:
bmOTKLEGGy