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: ['p', 'n', 'c', '113', '105', '423', 'k', 'a', '211', 'k', '91', '389']

Answer: 0, 1, 2, 3, 4, 5, 8, 9


Question: ['e', 's', '153', 'e', '377', 'c', 'v', '437']

Answer: 1, 3, 4, 5, 7


Question: ['291', '101', 'y', '421', '197']

Answer:
0, 1, 2, 4, 7, 9