var a: array[1..10000] of char;
    i, n, l, c: integer;
begin
 assign(input,'text.in');
 reset(input);
 assign(output,'text.out');
 rewrite(output);

 n:=0; l:=0; c:=1;
 while not eof do Begin
                        inc(n);
                        read(a[n]);
                        if (a[n] in ['a'..'z', 'A'..'Z']) then
                         Begin
                          inc(l);
                         if  a[n-1]=' ' then inc(c);
                         end;
                  end;
 writeln(l div c);
 close(input);
 close(output);
end.