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: ['Y', '3101', 'I', '8049', '807', '475', 'B', 'o', 'J', '9057', '8771', 'd', 'G']

25, 3101, 9, 8049, 807, 475, 2, 15, 10, 9057, 8771, 4, 7