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', '321', '355', 'w', 'm', 'v', 'a', 'u', '455', 'n', '169']

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


Question: ['229', '369', 'c', '7', 'f', 'h', '455', 't', '249', 's']

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


Question: ['o', '21', 'i', '449', '457', 'e']

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