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: ['k', 'x', '299', 'a', 'y', '105', 's', '249', 'g', '439', 'k', '1', 'h', 'd', '43']

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


Question: ['f', '253', '211', '85', 'm', 'y', 'l', 'r', 't', 'm', '193', 'p', '415', 'h', 'h']

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


Question: ['h', 'w', 'm', 'o', 'l', 'j', 'w', 'k', 'n', '489', 'r']

Answer:
4, 8, 9


