program scmax;
type vec=array [1..100000] of longint;
var i,n,m:longint;
    f,t:text;
    a,b:vec;
begin
  assign(f,'scmax.in');
  reset(f);
  assign(t,'scmax.out');
  rewrite(t);
  read(f,n);
  for i:=1 to n do
    read(f,a[i]);
  m:=0;
  for i:=1 to n do
    begin
      if a[i]<a[i]+1
        then begin
               m:=m+1;
               b[m]:=a[i];
             end;
    end;
  writeln(t,m);
  for i:=1 to m do
    write(t,b[i]);
  close(f);
  close(t);
end.