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

Ex Input:
TizkNtJUPHfhmGQ, enzehVkNtJUPHunpG

Ex Output:
kNtJUPH


Ex Input:
yRhCObvPZYoKUoQnyaatR, NHzLJYPZYoKUoQnJnIsZxC

Ex Output:
PZYoKUoQn


Ex Input:
UdCJoMMI, CSDiCJoMRnuh

Ex Output:

CJoM