In this task, you are given an input list A. You need to extract and sort the unique digits used in the list in ascending order. Return -1 if there is no digit in the list.
--------
Question: ['g', 'g', 'r', 'g', 'b', 'z', '441', 'z', 'f', '35', 'x', '327', 'l', 'n']

Answer: 1, 2, 3, 4, 5, 7


Question: ['k', '217']

Answer: 1, 2, 7


Question: ['259', '491', '411', 'p', 'f', 'y', '195', 'e', '79', 'k', 'z', 'o', '379']

Answer:
1, 2, 3, 4, 5, 7, 9


