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

sCMyALRSDknURKqZDlqFf, oEIfHyALRSDknUrnMebev
yALRSDknU

sOSXbnluNuvwMETKda, JzXbnluNuvyeVHO
XbnluNuv

EJOskXO, VIOskkxf

Osk