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: ['7303', '2531', 't', '3141', '4361', 'm', '5997', '6047', '5159', '1311', 'o', '3691', 'M', '407', '3855', 'q', '8965', 'R', '4989', 'W', '2957']

7303, 2531, 20, 3141, 4361, 13, 5997, 6047, 5159, 1311, 15, 3691, 13, 407, 3855, 17, 8965, 18, 4989, 23, 2957