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: ['C', '6787', 'k', '449', '8793', '2403', '3745', '8657', '1339', 'z', 'y', '3547', 'N', '6177', 'v', 'D', 'x', '4539', '2913', 'e', '7459', 'Q', '4443', '969', '2227', 'D', 'W', '173', '7979', 'L', 'N', '277', 'z', 'o', '9249', '5383', '4881', 's']

3, 6787, 11, 449, 8793, 2403, 3745, 8657, 1339, 26, 25, 3547, 14, 6177, 22, 4, 24, 4539, 2913, 5, 7459, 17, 4443, 969, 2227, 4, 23, 173, 7979, 12, 14, 277, 26, 15, 9249, 5383, 4881, 19