var
s: string;
i: integer;
begin
WriteLn('Введите строку: ');
Readln(s);
i := 1;
while i < Length(s) do
begin
while Pos(s[i], Copy(s, i + 1, 255)) > 0 do
delete(s, Pos(s[i], Copy(s, i + 1, 255)) + i, 1);
inc(i);
end;
WriteLn(s)
end.