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: ['H', 'B', '835', '8003', '9337', 'I', 'u', '9475', 'v', '9655', 'J', 'D', '6849', 'C', '9897', 'q', 'I', '7459']

8, 2, 835, 8003, 9337, 9, 21, 9475, 22, 9655, 10, 4, 6849, 3, 9897, 17, 9, 7459