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: ['1483', '6003', 'G', '289', '7483', '587', 'r', 'V', '201', 'G', 'W', 'I', 'h', 'Q', '9973', '3343', 'h', 'Z', 'X']

1483, 6003, 7, 289, 7483, 587, 18, 22, 201, 7, 23, 9, 8, 17, 9973, 3343, 8, 26, 24