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', 'I', '8057', 'S', 'o', 'a', '7161', 'i', '6825', '2703', 'd', 'M']

1, 9, 8057, 19, 15, 1, 7161, 9, 6825, 2703, 4, 13