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: ['r', '233']

SOLUTION: 2, 3

PROBLEM: ['163', '375', 'e', 'g', '115', '445', 'c', '393', 'm', '59']

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

PROBLEM: ['f', 'q', 'n', '473', '409', 'v', '409', '199', 'w', 'f', 'c', '493']

SOLUTION:
0, 1, 3, 4, 7, 9