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: ['S', '1443', 'N', 's', 'O', 'W', '783', '6127', 'f', 'A', 'e', 'G']

19, 1443, 14, 19, 15, 23, 783, 6127, 6, 1, 5, 7