1, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 2, 20, 21, 22, 23, 24, 25, 26, 28, 3, 30, 32, 34, 36, 38, 4, 40, 42, 44, 46, 48, 5, 50, 52, 54, 6, 7, 8, 9