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: ['U', 'X', '497', 'i', 'd', 'g', '881', '1083', 'W']

21, 24, 497, 9, 4, 7, 881, 1083, 23