Definition: 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.
Input: ['3705', 'R', 'c', 'G', '7397', '3197', 'O', 'G', 'W', 'd', '903', '553', 'M', 'h', '6153', '3423', 'l', '5017', 'k', '4399', '3573', '2293', 'u', '6199', '1327', 'R', 'X', 'l', '6699', '9501', '857', 'Y', '507', 'z', '2255']

3705, 18, 3, 7, 7397, 3197, 15, 7, 23, 4, 903, 553, 13, 8, 6153, 3423, 12, 5017, 11, 4399, 3573, 2293, 21, 6199, 1327, 18, 24, 12, 6699, 9501, 857, 25, 507, 26, 2255