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: ['6903', 'P', 'I', '9633', '9829', '7585', 'h', 'A', '5673', '2455', 'V', '4609', 'f', 'T', 'x', '3193', 'Y', 'm', 'O', 't', 'd', 'G', 'b', 'R', '8129', '3313']

6903, 16, 9, 9633, 9829, 7585, 8, 1, 5673, 2455, 22, 4609, 6, 20, 24, 3193, 25, 13, 15, 20, 4, 7, 2, 18, 8129, 3313