In this task, you are given an input list A. You need to convert all the alphabets in the list with a number representing their position in the English alphabet. E.g., replace A by 1, B by 2, a by 1, b by 2, and so on.

['B', '1491', 'Q', 'y', 'D', 'b', '1667', 'W', '9611', '3105', 'Z', '3705', '9391']
2, 1491, 17, 25, 4, 2, 1667, 23, 9611, 3105, 26, 3705, 9391

['B', 'z', '3345', 'n', 'E', '1329', 'c', 'G', 'n', '4519', 'J', 'r', 'C', 'C', 'y', 'g', 'm', 's', 'k', 'G', '4315', '8195', 'r', 'r', 'F', '5113', 'Y', '5907', 'L', '7943', 'D', '9443', 'b', 'Z', '8515', '179', 'M', 'u']
2, 26, 3345, 14, 5, 1329, 3, 7, 14, 4519, 10, 18, 3, 3, 25, 7, 13, 19, 11, 7, 4315, 8195, 18, 18, 6, 5113, 25, 5907, 12, 7943, 4, 9443, 2, 26, 8515, 179, 13, 21

['21', '8993', 'o', '2517', 'i', 'R', 'X', 'm', 'f', 'v', 'Z', 's', '2493', '1967', 'S', 'L', 'd', 'Y', '4755', 'S']

21, 8993, 15, 2517, 9, 18, 24, 13, 6, 22, 26, 19, 2493, 1967, 19, 12, 4, 25, 4755, 19