var
 S:string;
 i,j,N: integer;
 W:Array[1..255] of String;

Function Times(St:String):Boolean;
var
 b:boolean;
 k,p:integer;
begin
 b:=true;
 for k:=1 to Length(St)-1 do
  for p:=k+1 to Length(St) do
   if St[k]=St[p] then b:=false;
 Times:=b;
end;

begin
 writeln('Enter the string: ');
 readln(S);
 N:=1;
 i:=1;
 Repeat
  While (S[i]=' ') and (i<Length(S)) do Inc(i);
  W[N]:='';
  While (S[i]<>' ') and (i<=Length(S)) do
   begin
    W[N]:=W[N]+S[i];
    Inc(i);
   end;
  If i<Length(S) then Inc(N);
 Until i>=Length(S);
 For i:=1 to N do
  If Times(W[i]) then Write(W[i]+' ');
 Readln
End.