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.
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Question: ['431', '245', '23', 'c', '185', 'k', '155', '163', 'e', '35', 'r', '175', '163']

Answer: 1, 2, 3, 4, 5, 6, 7, 8


Question: ['415', '365', '373', 't', 'n']

Answer: 1, 3, 4, 5, 6, 7


Question: ['l', 'd', 'o', 't', '269', 'x', 'c', 'g', 'x', '469', 'k']

Answer:
2, 4, 6, 9