var a:char;
    lit:int64;
    cuv:longint;
    f,g:text;
    ok:boolean;

begin
 assign(f,'text.in');reset(f);
 assign(g,'text.out'); rewrite(g);
 lit:=0; cuv:=0;
 ok:=false;
 while not eof(f) do
  begin
   read(f,a);
   if (a in ['a'..'z']) or (a in ['A'..'Z']) then begin
                                                    ok:=true;
                                                    lit:=lit+1;
                                                   end
                                              else if ok=true then begin
                                                                    ok:=false;
                                                                    cuv:=cuv+1;
                                                               end;
  end;
 write(g,lit div cuv);
 close(f);
 close(g);
end.