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: ['D', '6993', 'N', '3761', 'C', 'o', '669', '8637', '9965', 'p', 'I', '1279', 'r', '7845', 'j', 'O', '6067', '675', '8553', '1351', '487', '7411', 'I', 'w', 'm', 'u', 'P', 's']

4, 6993, 14, 3761, 3, 15, 669, 8637, 9965, 16, 9, 1279, 18, 7845, 10, 15, 6067, 675, 8553, 1351, 487, 7411, 9, 23, 13, 21, 16, 19