program textsdfg;
var f,g:text;
c:char;
s,p:integer;
begin
assign(f,'text.in');reset(f);
assign(g,'text.out');rewrite(g);
while not eof(f) do begin
read(f,c);
if (c>'a')and(c<'z')and(c>'A')and(c<'Z') then begin  s:=s+1; t:=0;end
else t:=1;
if (s>0)and(t=1) then p:=p+1;
end;
write(g,trunc(s/p));
close(f);
close(g);
end.