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: ['r', 't', '3539', 'z', 't', '6055', 'r', '5787', '8469', 'p', 'h', '9729', 'z', '1637', '5873', 'c', '3597', '4411', 's', 'k', 'q', '6471', '5375', 'e', 'v', 'i', '7425', 'h', '9079', 'd', '1585', '6011', 'x', '5669', '5219', '4951', '4765', '8285', '2811', 'c', '1805', '6463']

Output: c, d, e, h, i, k, p, q, r, s, t, v, x, z


Input: Consider Input: ['p', 'g', 'q', 'e', '8045', '9999', '9555', '7995', '7195', 'z', 't', '5223', '3699', 'i', '4797', '3817', 'x', 'y', 'w', 'o', '8915', '7803', 'n', '1117', 'c', '9647', 'p', 'e', '9669', '4845', '9255', '4545', '3693', '6871', 'w', '4327', '3285', 'k', 'f', 'x', 'i', 'b', '5967', '6601']

Output: b, c, e, f, g, i, k, n, o, p, q, t, w, x, y, z


Input: Consider Input: ['7099', '8535', 'q', 'i', '3339', 'g', '9523', '1461', 'b', 't', 'm', 'g', '1439', '8539', 's', 'i', 'm', '5811', 'm', 'y', '2473', 'm', 'l', '4147', '6937', '1061', '2723', 's', 'g', '2541', 'd', '8487', '7781', 'd', 'p']


Output: b, d, g, i, l, m, p, q, s, t, y