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.
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Question: ['565', 'i', '615', '3047', 'm', '195', '7547', '3003', '9213', '9063', 'c', '5099', 'v', '5003', '9053']

Answer: c, i, m, v


Question: ['e', 'c', '4241', '2685', 'o', '9859', 'z', '2647', 'b', 'c', 'y', '1985', '5985', '5709', '6655', 'q', 'z', '9933', '6817', '6477', '1837', 'x', 'p', '9251', '3787', 'v', '5741', 'e', 'p', '493', '5949', '5519', 'v', 'g', '1403', 'z', 'h', 'z']

Answer: b, c, e, g, h, o, p, q, v, x, y, z


Question: ['9413', 'e', '3123', '8689', '9767', '5941', 'j', '6839', '4429', 'o', 's', '3183', 'i', 'x', '523', 'k', 'o', '3693', 'l', 'y', 'x', 'p', '9315', 'j', 'a', 'y', 'g', '5401', 's', '7677', '9325', '767']

Answer:
a, e, g, i, j, k, l, o, p, s, x, y