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: ['223', '71']

SOLUTION: 1, 2, 3, 7

PROBLEM: ['287', 'y', 'b', '79', '39', 'l']

SOLUTION: 2, 3, 7, 8, 9

PROBLEM: ['j', '107', '87', '293', '223', 'v', 'f', 'u', '467', 't', '115', 'd', 'b']

SOLUTION:
0, 1, 2, 3, 4, 5, 6, 7, 8, 9