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

[EX Q]: SUueHhzGsanfsalEEc, KygEhzGsanfsapbKKX
[EX A]: hzGsanfsa

[EX Q]: HHJAHyvNCGmJEljWrjvHOqf, msPVEbNCGmJEljsKRX
[EX A]: NCGmJElj

[EX Q]: HpGzCFl, hbGzCabz
[EX A]:
GzC