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

Ex Input:
LeHzcEFc, WFzcExvJ

Ex Output:
zcE


Ex Input:
CxwZWv, mkwZgM

Ex Output:
wZ


Ex Input:
ooyijqEWUBkbcZ, TdbijqEWUdYu

Ex Output:

ijqEWU