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

Input: Consider Input: UldKHMpUYADGfEUGcSon, nPHMpUYADGfEKqHCLPmL

Output: HMpUYADGfE


Input: Consider Input: YXsgPE, ENsgSO

Output: sg


Input: Consider Input: BzcJQokGRdLV, pxpcQokGSy


Output: QokG