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.

Input: Consider Input: ['8527', 'p', '4697', '8415', 'v', 'l', '2669', '2649', '4349', '4201', 'r', '7573', '2041', 'f', '8047', 'u', 'm', 'm', 'j', '5695']

Output: f, j, l, m, p, r, u, v


Input: Consider Input: ['d', 'p', 'q', '5319', 'w', '4887', '6695', 't', '7711', 'l', '7597', 's', 'n', '1461', 'e', '9045', '1307', 'j']

Output: d, e, j, l, n, p, q, s, t, w


Input: Consider Input: ['m', '6737', 'b', '927', 'l', 'i', 'y', '6309', 'o', '9679', 'p', 'e', '6065', '5115', 'h', 'u', 'a']


Output: a, b, e, h, i, l, m, o, p, u, y