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: ['301', 'E', '8831', '4311', '2283', 'M', '8765', '9515', '1241', '3779', '6873', '9561', '9047', 'U', '7961', 'd', 'r', '7025', '4011', '6605', '6201', '7119', 't', '1531', 'f']

301, 5, 8831, 4311, 2283, 13, 8765, 9515, 1241, 3779, 6873, 9561, 9047, 21, 7961, 4, 18, 7025, 4011, 6605, 6201, 7119, 20, 1531, 6