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

Input: Consider Input: lrBJDRkT, jmBJDrI

Output: BJD


Input: Consider Input: SUueHhzGsanfsalEEc, KygEhzGsanfsapbKKX

Output: hzGsanfsa


Input: Consider Input: OEnHbxBIrlLMcXG, LWrJbxBIrlpZldGb


Output: bxBIrl