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: ['e', 'o', 'c', 'j', 'g', '249', 's', 'b', 'f', '359', '107', 'i']

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

PROBLEM: ['217', 'c', 'h', 'e', 't', '331', '69']

SOLUTION: 1, 2, 3, 6, 7, 9

PROBLEM: ['415', '365', '373', 't', 'n']

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