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: ['A', 'O', 'r', '1993', '4409', '3703', 'Q', 'P', '3019', '6843', '2443']

1, 15, 18, 1993, 4409, 3703, 17, 16, 3019, 6843, 2443