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

jyJrDIhxJtWbnooEXZ, uyXifNCIhxJtWbnVCUrt
IhxJtWbn

sOSXbnluNuvwMETKda, JzXbnluNuvyeVHO
XbnluNuv

mgQVDnabCCkxXyAniIOZ, TcCCkxXyAnjkEYriSB

CCkxXyAn