57. Use the digits $0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9$ to form 5 four-digit numbers, such that the sum of these 5 numbers has all odd digits. What is the largest possible sum? $\qquad$
Answer: 39951