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: ['D', '3945', 'q', '7527', '2209', '633', 'J', 'r', '5843', '6515', '4915', 'c', 'f', 'm', '7467', '5663', '1609', 'D', 'C', '3693', 'j', 'x', 'n', 'w', 'V', 'f', '1021', 'w', '7515', '503']

4, 3945, 17, 7527, 2209, 633, 10, 18, 5843, 6515, 4915, 3, 6, 13, 7467, 5663, 1609, 4, 3, 3693, 10, 24, 14, 23, 22, 6, 1021, 23, 7515, 503