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

Input: Consider Input: kyADtWLlnmYv, tcaKvDtWLlnvBq

Output: DtWLln


Input: Consider Input: iupYjFXrrMqWzJSLUSwmEukHc, hqajjWrrMqWzJSLnF

Output: rrMqWzJSL


Input: Consider Input: NKFDTESPXIS, PVUTESPXXlX


Output: TESPX