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

Input: Consider Input: yywhNdZQkLSzbOvhluicHA, lfZQkLSzbOvhVC

Output: ZQkLSzbOvh


Input: Consider Input: RinootTGLjbRGYznmBdH, oRMtTGLjbRGYzwEVHsjW

Output: tTGLjbRGYz


Input: Consider Input: OyXwTWbLByC, yODnTWbLWYzc


Output: TWbL