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

OezHeoe, ouUzHemU
zHe

tWJoKSOAuVhmsomA, emdmnBFJoKSOAuVzSgW
JoKSOAuV

hiFjnxDsglynNKNIoni, dtqzSrZCVwjnxDsglynNVxhuWOA

jnxDsglynN