const semne=['.','!','?',',',';','-'];
var  s:string;
     f,g:text;
     i,c,l:integer;
begin
assign(f,'t.in');reset(f);
assign(g,'t.out');rewrite(g);
read(f,s);
for i:=1 to length(s) do begin
if (s[i]=' ') or (s[i] in semne) then
if ((s[i-1]>='a') and (s[i-1]<='z')) or ((s[i-1]>='A')and (s[i-1]<='Z'))  then c:=c+1;
if (s[i]<>' ') and  (not(s[i] in semne)) then l:=l+1; end;
write(g,l div c);
close(f);
close(g);
end.