var c :char;
    k,l,i,j : longint;
begin
    assign(input,'text.in'); reset(input);
    assign(output,'text.out'); rewrite(output);
    i:=1;
while not eof(input) do begin
    read(c);
    j:=1;
    if (ord(c)>=65) and (ord(c)<=90) then l:=l+1;
    if (ord(c)>=97) and (ord(c)<=122) then l:=l+1;

    if (i=1) and (c='-') then i:=i+1
                         else if (i<>1) and (c='-') then k:=k+1;

    if (i=1) and (c<>' ') and (c<>'-') then k:=k+1;
    IF c=' ' THEN k:=k+1;
    if (c='.') or (c='!') or (c='?') then i:=1;


                      end;




    writeln(l div k);
    close(input); close(output);
end.