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: ['9143', '9501', 'f', '8491', '3159', '4325', 'b', '1247', '3861', '3871', '6945', '2697', 'K', '5121', '9343', 'D', '3221', '5501', '3411', '5385', 'A', '907', '565', '9287', '5853', '4603', '3489', '5987', 'j', '8365', '3247', '183', 'i', '6851', 'z']

9143, 9501, 6, 8491, 3159, 4325, 2, 1247, 3861, 3871, 6945, 2697, 11, 5121, 9343, 4, 3221, 5501, 3411, 5385, 1, 907, 565, 9287, 5853, 4603, 3489, 5987, 10, 8365, 3247, 183, 9, 6851, 26