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: ['477', 'a', 'n', 'r', '457', 'g', 'c']

Answer: 4, 5, 7


Question: ['101', '473', '25', 'i', '117']

Answer: 0, 1, 2, 3, 4, 5, 7


Question: ['o', '199', 'g', 'h', '303', '83', 'g', 't', '225', '385']

Answer:
0, 1, 2, 3, 5, 8, 9