[R] how to order each element according to alphabet

[onthetopo]

Hi there,

  I have a large amino acid csv file like this:

input.txt:
P,LV,Q,Z
P,VL,Q,Z
P,ML,QL,Z

There is a problem with this file, since LV and VL are in fact the same
thing.   
How do I order each element according to alphabetical order so that the
desired output would look like:

output.txt:
P,LV,Q,Z
P,LV,Q,Z
P,LM,LQ,Z




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