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: ['71', '7', '341', '199', 'z', 'x', '201']

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

PROBLEM: ['85', '53', '43', 'j', 'e', '443', '231', 'z', 'f', 'v', '235', '377']

SOLUTION: 1, 2, 3, 4, 5, 7, 8

PROBLEM: ['349', '339', '297', '209', 'r', '405', 'v', '323', '351', 'j', 'u', 'k', 'r', 'l']

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