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

Ex Input:
wbdHVigIkjNkuAmbr, iSgIkjNkQYyn

Ex Output:
gIkjNk


Ex Input:
HEVqGddewrNqiZ, iyvlddewrNXr

Ex Output:
ddewrN


Ex Input:
KHNnpMIpCjZYZLS, jLeGOJNnpMIpCNSZyzW

Ex Output:

NnpMIpC