Display Sentence in Alphabetical Order Write a program that takes a string and outputs all the characters in alphabetical order.
Spaces and symbols can be ignored or deleted, but the upper- and lowercase letters must remain the same case.

Sample input:

Johnny walked the dog to the park.


Sample output

aaddeeeghhhJklnnoooprtttwy


Rules:

• Any language

• Shortest code wins.
GolfScript, 24 / 6 characters
{26,{65+.32+}%?)},{31&amp;}$

Example:
&gt; Johnny walked the dog to the park.
aaddeeeghhhJkklnnoooprtttwy  

If the input is restricted to printable ascii the code can be shortened by three characters using {95&amp;.64&gt;\91&lt;&amp;}, as filter.
Can be tested here.
The can-be-ignored version is even shorter (6 chars):
{31&amp;}$

and yields output
&gt; Johnny walked the dog to the park.
      aaddeeeghhhJkkl.nnoooprtttwy