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: ['c', 'm', 'h', 'c', '69', '233', 'j', 'g', 'r', 'x', '59', 'p', '469']

SOLUTION: 2, 3, 4, 5, 6, 9

PROBLEM: ['e', '313', '259', 'i', 'h']

SOLUTION: 1, 2, 3, 5, 9

PROBLEM: ['35', 'c', '307']

SOLUTION:
0, 3, 5, 7