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: ['z', 'c', 'n', '351', 'f', '239', '71', '351', 'b', '1', '321', 'h', '163']

SOLUTION: 1, 2, 3, 5, 6, 7, 9

PROBLEM: ['o', '61', '475', '457', 'a', 'o', 'z', '227', '415', 'z', 'x', 'y', '73', '205', 'y']

SOLUTION: 0, 1, 2, 3, 4, 5, 6, 7

PROBLEM: ['49', 'p', 'm', '389', 'f', '5', 'g', 'b', '87', '231']

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