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: ['u', '343', '167', 'a']

Answer: 1, 3, 4, 6, 7


Question: ['c', '31', '49', 'x', 'n', 'i', 'a', '135', '65', '401', 'b', '213', 'f', '321']

Answer: 0, 1, 2, 3, 4, 5, 6, 9


Question: ['x', '469', '407', 'u', 'i', 'n', '3', '117', 'r']

Answer:
0, 1, 3, 4, 6, 7, 9