Problem sorting file

I have a file

Quote:

Mrs,NJ,Nicola, Mr,SP,Stuart,D Mrs,R,Rhian,Ro Mr,S,Sam,Barto Mrs,SA,Susan,R Mr,S,Scott,Bro Mrs,S,Shiralee, Mr,S,Stephen,C Mr,S,Symon,Wil Mrs,TM,Tracey, Mr,SV,Stephen,

I want to sort it into title order so the male title comes before the female title. So I use -

Code:sort < input.unsortedWhich gives me

Quote:

Mrs,NJ,Nicola, Mr,SP,Stuart,D Mrs,R,Rhian,Ro Mr,S,Sam,Barto Mrs,SA,Susan,R Mr,S,Scott,Bro Mrs,S,Shiralee, Mr,S,Stephen,C Mr,S,Symon,Wil Mrs,TM,Tracey, Mr,SV,Stephen,

The file appears to remain unsorted!

Alex