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: ['i', 'W', '8501', '4589', 's', '1785', '4575', '3697', '9841', 'y', '7529', '4883', 'G', 'y', 'w', 'z', '6819', 'H']

9, 23, 8501, 4589, 19, 1785, 4575, 3697, 9841, 25, 7529, 4883, 7, 25, 23, 26, 6819, 8