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: ['A', '4439', 'l', '4745', 'm', 'A', 'o', 'N', '7349', '8035', 'A', '4553', '8729', 'x', 'G', '3041', 'W', 'R', 'N', 'h', '3111', 'B', '9995', 'Y', 'J', 'P', '7729', '8463']

1, 4439, 12, 4745, 13, 1, 15, 14, 7349, 8035, 1, 4553, 8729, 24, 7, 3041, 23, 18, 14, 8, 3111, 2, 9995, 25, 10, 16, 7729, 8463