program consonants;

function consonant_counter(s:string):string;
const letters = ['A'..'Z'];
const vowels = ['A','E','I','O','U'];
var counter:array['A'..'Z'] of integer;
	i, len:integer;
	c:char;
begin
	s:=UpCase(s);
	len:=Length(s);
	for c:='A' to 'Z' do begin
		counter[c]:=0;
	end;
	
	for i:=1 to len do begin
		if (s[i] in letters) and not (s[i] in vowels) then begin
			inc(counter[s[i]]);
		end;
	end;
	
	consonant_counter:='';
	for c:='A' to 'Z' do begin
		if counter[c] = 1 then begin
			consonant_counter := consonant_counter + c;
		end;
	end;
end;

var s;

begin
	readln(s);
	writeln(consonant_counter(s));
end.