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: ['4945', 'o', 'y', '8471', '763', 'X', '1729', '8063', 'k', '1753', 'v', '7091', 'E', 'o', 'v', 'K', 'v', 'L']

4945, 15, 25, 8471, 763, 24, 1729, 8063, 11, 1753, 22, 7091, 5, 15, 22, 11, 22, 12