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: ['8545', 'u', 'O', '1129', '9425', 'Q', '4087']

8545, 21, 15, 1129, 9425, 17, 4087