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

CkZOSZevST, bbZOSZIg
ZOSZ

yRhCObvPZYoKUoQnyaatR, NHzLJYPZYoKUoQnJnIsZxC
PZYoKUoQn

kpnjlnAJVQ, PToRnjlnbM

njln

