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: ['u', 'c', 'f', 'z', '51', '301', 'q', '275']

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

PROBLEM: ['r', 'u', '83', 'x', '155', '89', 'c', '391', '41', 'o', 'i', '161']

SOLUTION: 1, 3, 4, 5, 6, 8, 9

PROBLEM: ['k', 's', '245', 'p', 'm', 'd', '447', '173', '211', '231']

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