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', '7671', 'b', 'H', 'a', '8659', '8719', '3395', '4327', '9895', 'U', 'h', '1383', 'L', '9831', '9733', '9633', '9261', '9269', '307', '4703', 'e', '209', '9443']

1, 7671, 2, 8, 1, 8659, 8719, 3395, 4327, 9895, 21, 8, 1383, 12, 9831, 9733, 9633, 9261, 9269, 307, 4703, 5, 209, 9443