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

[Q]: EOwHDdhJcP, DrIuDdhJYw
[A]: DdhJ


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


[Q]: OlNkMfyTknRwqRJAkuKlHmB, vCeknRwqRJAkXMmuW
[A]:
knRwqRJAk