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: ['r', '171', 'p', '299', 'u', 'n', '421', '331', 'h', '21', 'h', 'x', '435', '327', '373']

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


Question: ['405', 'x', '163', 'z', 'z', '261', 'o']

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


Question: ['463', '195', '293', '37', 'm', 'w', 'g', 'p', '475', 'e', 'z', 'j', '357', '201', 'd']

Answer:
0, 1, 2, 3, 4, 5, 6, 7, 9