How to create vertex with default value?

from the support

CREATE VERTEX vertex_type_name (PRIMARY_ID id_name type

[, attribute_name type [DEFAULT default_value] ]*)

[WITH STATS=“none”|“outdegree_by_edgetype”]

but it gets wrong like

create vertex device (primary_id SpecID string,Label1 string DEFAULT a)

how can I set a default value Label1==‘a’?

Please see the change in red color.

create vertex device (primary_id SpecID string,Label1 string DEFAULT “a” )

Thanks.