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

Ex Input:
EeUODjkxsQeTSNsHYpBKIUvEuAKhB, SrpZeTSNsHYpBKdhPFlgMh

Ex Output:
eTSNsHYpBK


Ex Input:
aWshKwEuYBBdSwIAyXw, wfVuYBBdSwIAseTxR

Ex Output:
uYBBdSwIA


Ex Input:
ZTmAlnESgHwJGAWzHx, HoNflnESgHwdlV

Ex Output:

lnESgHw