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: ['k', 'q', 'a', 'u', 'q']

SOLUTION: -1

PROBLEM: ['o', '61', '475', '457', 'a', 'o', 'z', '227', '415', 'z', 'x', 'y', '73', '205', 'y']

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

PROBLEM: ['m', '269', '183', '459', 'c', 'f', '401', '1']

SOLUTION:
0, 1, 2, 3, 4, 5, 6, 8, 9