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: ['i', 'i', 'h', 'g', '5123', 'i', 'r', '3183', 'w', 'g', 's', '9777', '455', 'l', 'r', 'h', 'e', 's', 'v', '6823', '463', '9603', 'e', '947', '7071', 'c', '3373', 'j', 'w', 'm', 's', 's', '3483', '9567']

Output: c, e, g, h, i, j, l, m, r, s, v, w


Input: Consider Input: ['1223', 'h', 'a', 'o', 'v', '2535', 'g', '6267', 'w', '9625', '7961', '9577', '7611', '5655', 'p', 'j', 's', '2141', '4101', 'l', '4367', '9383', 'n', '5965', '9097', '7571', 'p', 'u', 'x']

Output: a, g, h, j, l, n, o, p, s, u, v, w, x


Input: Consider Input: ['b', 'i', 'a', 'u', 'w', 'o', 's', 'i', 'z', '153', '6533', 'p', '5517', 'u', 'l', 'p', 't', '9241', '9321', '987', 'g', '5553', '3645', '6009', '6593', '7201', '7717', 'n', 'h', 'v', 'c', '7275', '6927', 'n']


Output: a, b, c, g, h, i, l, n, o, p, s, t, u, v, w, z