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

EJZYVxgFxPoOSDlLfK, uTLTIETHZYVxgFxPoPwr
ZYVxgFxPo

ylyLVUjsmMrXMFAPDGIZsHq, cYymMrXMFAPjm
mMrXMFAP

KDEoNRpPTpEscc, plvdgcBEoNRpPTpETDngi

EoNRpPTpE