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

Example Input: SUueHhzGsanfsalEEc, KygEhzGsanfsapbKKX
Example Output: hzGsanfsa

Example Input: trHTzJpm, aCHTzVVA
Example Output: HTz

Example Input: hogPxKThdGVItrGxESvMRHyVu, HzzjqfAvXwVItrGxESvMyweZNILXFA
Example Output:
VItrGxESvM