Program texte;
   var litere,simboluri:set of char;
       ch:char;
       suma,cuvinte:longint;
       f:text;
begin
  assign(f,'text.in'); reset(F); read(f,ch);
  litere:=['a'..'z','A'..'Z']; simboluri:=[chr(1)..chr(127)]-litere; suma:=0; cuvinte:=0;
  while not eof(f) do  begin
     while not eoln(f) do begin
       while ch in simboluri do read(f,ch);
       if ch in litere then begin inc(cuvinte);
                                  while ch in litere do begin
                                 inc(suma); read(f,ch);  end; end; end; readln(f);
     end;
    close(f); assign(f,'text.out'); rewrite(f);
    writeln(f,suma div cuvinte); close(f); end.