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

Input: Consider Input: yRhCObvPZYoKUoQnyaatR, NHzLJYPZYoKUoQnJnIsZxC

Output: PZYoKUoQn


Input: Consider Input: GlAYDsKQoXy, IxDsKQuK

Output: DsKQ


Input: Consider Input: upNlKzSUhJAHppdYbIPDP, saVtZMlslszSUhJAHppdXBvvUC


Output: zSUhJAHppd