program text_infoarena;
var c:char; x,nrc,nrl,aux:longword;
    f,g:text;

function lit(c:char):boolean;
begin
lit:=false;
if (((c>='a')and(c<='z'))or((c>='A')and(c<='Z')))then lit:=true;
end;

begin
assign(f,'text.in');reset(f);
assign(g,'text.out');rewrite(g);
nrl:=0; nrc:=0; aux:=0;
while not eof(f) do
 begin
  read(f,c);
  if lit(c)then inc(aux)
           else begin
                if (aux>0)then inc(nrc);
                inc(nrl,aux); aux:=0;
                end;
 end;
x:=nrl div nrc;
writeln(g,x);
close(f); close(g);
end.