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: ['9629', '9783', 'C', '1803', 'r', '7073', '9865', 'd']

9629, 9783, 3, 1803, 18, 7073, 9865, 4