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: ['7921', '9683', '8463', 'k', '2457', '6089', '1257', '9803', '373', '3619', 'J', 'B', 'W', 'o', '9577', 'M', 'w', 'r', '8085', 'q', 'B', 'f', '8643', 'A', '7979', 'P', '8895', 'L', 'a', '7771', '7751', 'q', '6697', '8081', 'a', '4357']

7921, 9683, 8463, 11, 2457, 6089, 1257, 9803, 373, 3619, 10, 2, 23, 15, 9577, 13, 23, 18, 8085, 17, 2, 6, 8643, 1, 7979, 16, 8895, 12, 1, 7771, 7751, 17, 6697, 8081, 1, 4357