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: ['J', '4677', 'm', 'U', '9821', 's', '7249', 'D', 'P', '9305', 'j', '6319', '6993', '3087', '7493', 'C', '9849', '7639', 'S', 'x', 'U', 'G', '1029', '9047']

10, 4677, 13, 21, 9821, 19, 7249, 4, 16, 9305, 10, 6319, 6993, 3087, 7493, 3, 9849, 7639, 19, 24, 21, 7, 1029, 9047