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: ['G', '2801', '6343', '4787', 'u', '793', 'C', 'I', '2923', 'N', 'k', 'm', '8105', '8303', 'x', 'e', 'x', 'D', 'u', '2829']

7, 2801, 6343, 4787, 21, 793, 3, 9, 2923, 14, 11, 13, 8105, 8303, 24, 5, 24, 4, 21, 2829