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: ['1667', '2971', 'O', 'J', 'G', 't', 'Z', '7879', 'F', '4743', 'F', 'Q']

1667, 2971, 15, 10, 7, 20, 26, 7879, 6, 4743, 6, 17