SQL Server 2012 :: Return Multiple Messages To Client Application?

I have a procedure where after processing, i am required to send multiple message to calling application.

For ex:

create procedure test as
(@a as int,
@b as int
@c as int )
/*
some transformations */
print 'variable a is' + @a;
print 'variable b is' + @b;
print 'variable c is' + @c;

I am only providing a sample of return messages, but in reality there a lot more messages where a string and a parameter value need to concatenated.Unfortunately print is not allowing to concatenate parameter value.I can use RaiseError, but these messages are not really any error messages.

i tried to concatenate all message and output it using OUT type parameter, but the length of all messages combined exceeds 10000 characters.

Is there any other alternate to send these messages out to application?