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

koddLvYmRXDUuUnW, GnqDYGmmRXDUuUquAnf
mRXDUuU

cfvqbAUpWEmhCSFaUvGrYVNGeUiRP, hAxWMEmhCSFaUvGLBLmdTxhy
EmhCSFaUvG

gGRObIvCMJYTkjoZCAS, eQtpNFqVMJYTkjoZCUja

MJYTkjoZC