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: ['a', 'R', '5477', 'R', 'T', 'k', 'A', 'D', 'g', '5891', 'N', 'A']

1, 18, 5477, 18, 20, 11, 1, 4, 7, 5891, 14, 1