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.

Q: ['8301', 'd', 'p', 'l', 'm', '9099', 'o', '8045', 'e', 's', 't', '8853', 'v', '6375', 'q', '2505', 's', '4219', '3587', 'g', '651', '7129']

A: d, e, g, l, m, o, p, q, s, t, v
****
Q: ['3127', '9253', '5667', '9453']

A: -1
****
Q: ['7197', '5719', 'm', '3647', 'v', 'o', '7869', 'p', '5031', '8783', 'u', '6559', '2681', '635', '5941', '581', '1211', 'j', 'q', 'm', 'e', 'l', '8941', '6729', '6045', 'f', '7981', 'm', '4011', '2669', 'v', '5603', '3355', '5239', 'm', 'f']

A:
e, f, j, l, m, o, p, q, u, v
****