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

wnIFoRQvMMKMAqpCQYncuWUTJs, bPMUKKxYRxQvMMKMAqpCmzAPPMD
QvMMKMAqpC

yywhNdZQkLSzbOvhluicHA, lfZQkLSzbOvhVC
ZQkLSzbOvh

rLtvgeeUtfMHlwpYho, GUAvgeeUtfMHlGtaJDkOQQT

vgeeUtfMHl