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

Ex Input:
txJhzNeBj, qLJhzNesV

Ex Output:
JhzNe


Ex Input:
yOGvgtAmwMwcIRtJ, cQtAmwMwcIRjfjO

Ex Output:
tAmwMwcIR


Ex Input:
gGcLDWhZJyNhKvRDRF, tIQkhbuDWhZJyNVI

Ex Output:

DWhZJyN