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

Example Input: ohueEOjHvAuoFVmMFft, ovdJPqOjHvAuoFVGbvxzlnE
Example Output: OjHvAuoFV

Example Input: DhhYhrqVMXSoyvXQwqPKzWARAP, CaMXSoyvXQwqcDDtMsVqD
Example Output: MXSoyvXQwq

Example Input: DOwWQzReR, KDEkwWQzOH
Example Output:
wWQz