Redirect The Output To A Variable

This is my stored procedure .It is working fine .I want to capture the output in a print statement .Can anyone help me please .

alter proc r (@id INT)

as

BEGIN

DECLARE @input VARCHAR(800)

DECLARE @c_input INT

DECLARE @i_Input INT

DECLARE @input_left VARCHAR(800)

DECLARE @delimiter CHAR(1)

select @delimiter = ','

DECLARE @in VARCHAR(800)

DECLARE @list VARCHAR(800)

declare @list2 VARCHAR(800)



SET @input = 'db2,oracle,sybase'

select @c_input = (select dbo.Fx_CharCount(@delimiter,@input))

set @c_input = @c_input + 1

while @c_input > 0

BEGIN

select @i_input = charindex(@Delimiter,@input)

if @i_input != 0

BEGIN

select @input_left = left(@input, @i_input - 1)

END

else

select @input_left = @input

select @in = '''' + @input_left + ''''

select @list = ISNULL(@list + ',', '') + @in

select @input = right(@input ,(len(@input) - @i_input))

SET @c_input = @c_input -1

if @c_input = 0 or @input = @input_left

break

end

Print @list

EXECUTE ('SELECT Label FROM systemtype WHERE Label Not IN (' + @list + ')')

END




my actual task is like this
My input is a list of values seperated by commas
now my output should be list of values not in the table joined by comma

eg : if my table consists of list of all databases like

db2
oracle,
sybase,
mssql,
mysql,



myinput would be like this db2,sybase,oracle
my output should be mssql,mysql
how to get that
?



Any suggestions