The following worked for me.
# Returns a string with the letters in s in alphabetical order.
#
procedure alpha( s )
local result, c
result := ""
cset( s ) ? while c := move(1) do
s ? while tab( find ( c ) ) do result ||:= move( 1 )
return result;
end
procedure main()
while write( alpha( read() ) )
end
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