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

Ex Input:
ohueEOjHvAuoFVmMFft, ovdJPqOjHvAuoFVGbvxzlnE

Ex Output:
OjHvAuoFV


Ex Input:
sCMyALRSDknURKqZDlqFf, oEIfHyALRSDknUrnMebev

Ex Output:
yALRSDknU


Ex Input:
wPkaEZQOlyu, IcBNhkaEZQNB

Ex Output:

kaEZQ