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', 'f', 'l', 'a', 'c', '489', 'e', 'p', 'm', '175', 'l']

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


Question: ['469', 'y', 'j', 'u', '475', 'k', 'k']

Answer: 4, 5, 6, 7, 9


Question: ['55', '73', 'm', 'm', '451']

Answer:
1, 3, 4, 5, 7