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: ['2359', '3451', 'L', 'D', '2047', '1477', 'y', 's', 'K', 'H', '1191', '2469', '8537', '5279', '1897', '4753', 's', '9287', '3233', '5603', '1', '5839', '8975']

2359, 3451, 12, 4, 2047, 1477, 25, 19, 11, 8, 1191, 2469, 8537, 5279, 1897, 4753, 19, 9287, 3233, 5603, 1, 5839, 8975