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', 'O', '8921', 'k', 'T', 'g', '9349', '2977', '143', '2743', '7843']

7, 15, 8921, 11, 20, 7, 9349, 2977, 143, 2743, 7843