Card Magic link code

for n in nuke.selectedNodes():
    if n.Class()=='Camera2':
        camNode = n
    if n.Class()=='Card':
        cardNode = n
    if n.Class()=='cardmagic':
        cmNode = n

cmNode.setInput(0,cardNode.input(0))
cmNode.setInput(1,cardNode)
cmNode.setInput(2,camNode)