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: ['h', 't', '371', 'e', '153', 'b']

Answer: 1, 3, 5, 7


Question: ['343', '471', 'z', 'e', 'z', '351']

Answer: 1, 3, 4, 5, 7


Question: ['221', '73', 'e', 'y', 'r']

Answer:
1, 2, 3, 7