Detailed Instructions: In this task, you are given an input list A comprising of numbers and alphabets. You need to extract and sort the unique alphabets in the list. The alphabets in the input list will only be in lowercase. Return -1 if there is no alphabet in the input list.
Problem:['3883', 'c', '4179', 'c', '9961', '9443', '535', 'v', 'a', 'i', '9691', 'm', '1529', '5697', 'o', 'b', '9139', 'p', '5793', 'q', '9907', '7617', '8689', '5613', '4703', 't', '6659', 'c', 'x', 'j', '3441', 'u', 'w', 'e', '4789']
Solution:
a, b, c, e, i, j, m, o, p, q, t, u, v, w, x