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

Ex Input:
hCRsCCOoLMpjXwI, lVRCOoLMpxaYFbY

Ex Output:
COoLMp


Ex Input:
BICndZkjoSidWivWATvtqsS, FzVWjoSidWivFaQhkRT

Ex Output:
joSidWiv


Ex Input:
qPdLgV, jWdLZR

Ex Output:

dL