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: ['3107', 'u', 'd', 'X', '7041', '7677', '8639', 'x', '3871', '9795', 'k', '1599', 'N']

3107, 21, 4, 24, 7041, 7677, 8639, 24, 3871, 9795, 11, 1599, 14