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: ['9887', '3671', 'l', 'x', 'D', 'j', 'V', 't', 'o', 'y', 'K', 'f', 'K', '1053', '4163', '8913', '5775', 'D', 'G', '291', 'l', '725', 'A', '3817']

9887, 3671, 12, 24, 4, 10, 22, 20, 15, 25, 11, 6, 11, 1053, 4163, 8913, 5775, 4, 7, 291, 12, 725, 1, 3817