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: ['R', 'o', 'A', 'O', '8303', '6569', '453', 'g', 'O', 'D', '6765']

18, 15, 1, 15, 8303, 6569, 453, 7, 15, 4, 6765