TASK DEFINITION: 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.
PROBLEM: ['z', 'e', '75', '379', 'c', 'f', 'g', '381', 'l', 'u', '197', '489']

SOLUTION: 1, 3, 4, 5, 7, 8, 9

PROBLEM: ['159', 'y', '369', 'r', '341', '23', 's', '209', 'l', 's', '473']

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

PROBLEM: ['v', 'q', 'o', 'h', '433', 'f', '51', '471', 'w', '185']

SOLUTION:
1, 3, 4, 5, 7, 8