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

[Q]: UldKHMpUYADGfEUGcSon, nPHMpUYADGfEKqHCLPmL
[A]: HMpUYADGfE


[Q]: PShMbsbexXGlpBuMMDZZS, sVqGxSexXGlpBxuHXoI
[A]: exXGlpB


[Q]: nfZTCDQHIWgGodYpDcN, xQJIGiDWcTCDQHIWgGBQ
[A]:
TCDQHIWgG