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: ['9629', '3657', 'R', '4661', '8919', '363', 'W', '8479', 'o', 'x', '495', 'k', '369', '1047', '1935', '1873', 'W', 'd', 'w', '4565', '923', 'N', 'O', '549']

9629, 3657, 18, 4661, 8919, 363, 23, 8479, 15, 24, 495, 11, 369, 1047, 1935, 1873, 23, 4, 23, 4565, 923, 14, 15, 549