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

oiNEYHxbvAb, bcDDdEYHxbCREd
EYHxb

sRpnJlgECTHh, JXfmNJlgECKyry
JlgEC

GFhJafTV, waHhJaji

hJa