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

Input: Consider Input: QzJdafaGRLWEguLkOaw, brmPLBoaGRLWEguEaF

Output: aGRLWEgu


Input: Consider Input: zRwQdelc, UdAUwQdejhe

Output: wQde


Input: Consider Input: cjrUQpIOlSamkcrhspLpV, nMGlSamkcrhspcbd


Output: lSamkcrhsp