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

AkYuNemHGBEDF, uluNemHGAycbWX
uNemHG

OyXwTWbLByC, yODnTWbLWYzc
TWbL

kGRxbPDcCYccAaTRRR, HlhxSJDDcCYccAadiw

DcCYccAa