{Автор: Винарский 112 гр.}
program t12_15 (input, output);

function num: integer;
var
  c: char;
begin
  read(c);
  if c <> '.' then
  begin
      if (c >= '0') and (c <= '9') then
          num := num + 1
      else
          num := num
  end
  else
      num:=0
end;

begin
  writeln(num)
end.