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: ['99', 'p', 'v', '49', 's', '279', 'v', '287', '355', 'o', '131', 'd', 'b']

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

PROBLEM: ['r', 'f', 'l', 'a', 'c', '489', 'e', 'p', 'm', '175', 'l']

SOLUTION: 1, 4, 5, 7, 8, 9

PROBLEM: ['b', '215', 'u', 'm', 'a', '173', 'x', '423', 'e', 'l']

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