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: ['2699', '6979', 'i', 's', '2005', '8907', '5267', 'P']

2699, 6979, 9, 19, 2005, 8907, 5267, 16