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

Ex Input:
jyJrDIhxJtWbnooEXZ, uyXifNCIhxJtWbnVCUrt

Ex Output:
IhxJtWbn


Ex Input:
zmbmQuyNGOe, mUMEmQuyiuS

Ex Output:
mQuy


Ex Input:
qsXGvwI, xLXGvOjD

Ex Output:

XGv