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

Example Input: AedXEOrEgvnzF, TVTEOrEgvxKuJgv
Example Output: EOrEgv

Example Input: BdqUloJanutXoOyfLsuA, NRDloJanutXoOQY
Example Output: loJanutXoO

Example Input: hccdCzRx, XSVcdCAL
Example Output:
cdC