program Project1;
 
{$APPTYPE CONSOLE}
 
uses
  SysUtils;
 
const smax=99;
type large=array[0..99] of LongInt;
var data, sort:large; n, i, counter:smallint;
 
procedure swap(Var a, b:LongInt);
var t:LongInt;
begin
  t:=a;
  a:=b;
  b:=t;
end;
 
procedure writeArr(arr:large; n:SmallInt);
Var i:smallint;
begin
  for i:=0 to n-1 do write(arr[i], ' ');
  Writeln;
end;
 
function difNums(arr:large):large;
Var tArr:large; i, j:SmallInt; isSame:Boolean;
begin
  counter := 0;
  for i:=0 to n do begin
    isSame:=False;
    for j:=0 to counter-1 do begin
      if arr[i]=tArr[j] then begin
        isSame:=True;
      end;
    end;
    if isSame = False then begin
      counter := counter + 1;
      tArr[counter-1] := arr[i];
    end;
  end;
  difNums := tArr;
end;
 
procedure bubbleSort(Var arr:large; n:smallint);
Var i, j:smallint;
begin
  for i:=0 to n do begin
    for j:=i to n do begin
      if arr[i]>arr[j] then swap(arr[i], arr[j]);
    end;
  end;
end;
 
begin
  read(n);
  n:=n-1;
  for i:=0 to n do read(data[i]);
  sort:=difNums(data);
  bubbleSort(sort, counter-1);
  Writeln(counter);
  writeArr(sort, counter);
end.

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10
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