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: ['B', '625', '6887', '913', 'w', '4539', 'E', 'q', 'C']

2, 625, 6887, 913, 23, 4539, 5, 17, 3