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: ['i', '2153', '1477', '3615', 'V', 'Z', 'f', 'K', '8285', 'n', '1087', 'R', '3947', '8947', '2669']

9, 2153, 1477, 3615, 22, 26, 6, 11, 8285, 14, 1087, 18, 3947, 8947, 2669