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: ['247', 's', 'y', 'c', '421']

Answer: 1, 2, 4, 7


Question: ['u', '419', 'u', 'h', 'k', 'w', 'a', '289', 'd', 'v', 'u', '117', '327', '85', '441']

Answer: 1, 2, 3, 4, 5, 7, 8, 9


Question: ['x', 'a', 'b', 't', '155', '249', 'd', '421', '253', '17', '353', 'f', '397']

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