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: ['3467', 'R', 'h', '3841', '3671', '8435', '5715', '9135', 'g', 'p', '7293', '2175', 'e', 'e', '8217', 'b', '2831', 'L']

3467, 18, 8, 3841, 3671, 8435, 5715, 9135, 7, 16, 7293, 2175, 5, 5, 8217, 2, 2831, 12