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: ['4273', 'z', '5995', 's', 'n', '5401', 'W', '8093', '4475', '523', '7765', 'z', 'p', '7073', 'm', '7487', '2035', 'M', '969', '379', '9163', 'a', 'X', 'u', '4565', 'z', 'u', '3057', 'p', 'A', 'Y', '8281', 'V', 'f', '7629', '5921', '3859', 'G']

4273, 26, 5995, 19, 14, 5401, 23, 8093, 4475, 523, 7765, 26, 16, 7073, 13, 7487, 2035, 13, 969, 379, 9163, 1, 24, 21, 4565, 26, 21, 3057, 16, 1, 25, 8281, 22, 6, 7629, 5921, 3859, 7