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: ['w', '5341', 'b', '6243', 'v', '877', '1087', '6763', '5241', '3369', '9119', 't', 'v', 'j', '8261', 'o', 'b']

Output: b, j, o, t, v, w


Input: Consider Input: ['m', '6761']

Output: m


Input: Consider Input: ['9573', '7959', '9823', 'o', '8807', '7249', '1039', '6305', '4089', '1869', '9903', 'j', 'n', '1803', 's', '7501', 's', 'k', '8137', '2233', 'l', 'n', 'v', 'v', '1873', '3247', 'p', '927', 'u', '4279', '1937', 'w', '5697', 't', '695']


Output: j, k, l, n, o, p, s, t, u, v, w