program infoarena1;
var f,g:text;
    c:char;
    litere,cuvinte:longint;
begin
   assign(f,'text.in'); reset(f);
   assign(g,'text.out'); rewrite(g);
   litere:=0; cuvinte:=0;
   while not seekeof(f) do
      begin
      read(f,c);
      if ((c <= 'z') and (c >= 'a')) or ((c >= 'A') and (c <= 'Z')) then
         begin
         inc(cuvinte);
         while ((c <= 'z') and (c >= 'a')) or ((c >= 'A') and (c <= 'Z')) do
            begin
            inc(litere);
            read(f,c);
            end;
         end;
      end;
   writeln(g,litere div cuvinte);
   close(f); close(g);
end.