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: ['2171', '7015', 'i', '6309', '5247', '2313', '1719', '3791', '5677', '1221', '7543', '4057', 'Y', 'y', 'E', 'B', 'h', '5855', 'j', '7905', '6823', 'O', 'o', 'v', 'f']

2171, 7015, 9, 6309, 5247, 2313, 1719, 3791, 5677, 1221, 7543, 4057, 25, 25, 5, 2, 8, 5855, 10, 7905, 6823, 15, 15, 22, 6