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

Input: Consider Input: CkZOSZevST, bbZOSZIg

Output: ZOSZ


Input: Consider Input: YKpdeJQhzyYiPoODACUu, mjmnIlCehzyYiPoOzZ

Output: hzyYiPoO


Input: Consider Input: oCYADIVtiPor, kAIVtiPjkNTF


Output: IVtiP