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

Input: Consider Input: DFRoMPNDAzNgtLsEPseOzC, qykyPjDAzNgtLsEPYTsNrJaNK

Output: DAzNgtLsEP


Input: Consider Input: fAsWQxuyBevvLogrSrgg, tmdBEUxuyBevvLogXjiMCbh

Output: xuyBevvLog


Input: Consider Input: cctRTQCP, ipkRTQbyd


Output: RTQ