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

Input: Consider Input: sRpnJlgECTHh, JXfmNJlgECKyry

Output: JlgEC


Input: Consider Input: SeXNqRAbKdLuWXgb, npsIWRAbKdLuUWSbvuS

Output: RAbKdLu


Input: Consider Input: QWxGzBPzfgiiKmqW, WQtuYMnBPzfgiiQkny


Output: BPzfgii