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

Input: Consider Input: FQAznAuFjoBKRKB, hPmtFFPnuAznAuFjoBKTgkeJyjcd

Output: AznAuFjoBK


Input: Consider Input: YlhtTQgHiffTbIbBrcHMqFKCdWz, HyregFgMffTbIbBrcHYUnnQvGlx

Output: ffTbIbBrcH


Input: Consider Input: uPPXOLzo, aqvPXONY


Output: PXO