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: ['f', '291', '145', 'd', 'z', '355', 'r']

SOLUTION: 1, 2, 3, 4, 5, 9

PROBLEM: ['205', '107', 'z']

SOLUTION: 0, 1, 2, 5, 7

PROBLEM: ['111', 'l', 'y', 't', 'r', 'u', 'o', 'x', '429']

SOLUTION:
1, 2, 4, 9