A five-digit palindrome is a positive integer with respective digits abcba, where a is non-zero. Let S be the sum of all five-digit palindromes. What is the sum of the digits of S?<spanclass=′latex−bold′>(A)</span>9<spanclass=′latex−bold′>(B)</span>18<spanclass=′latex−bold′>(C)</span>27<spanclass=′latex−bold′>(D)</span>36<spanclass=′latex−bold′>(E)</span>45