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: ['q', '6499', '9517', 'C', '4935', 'C', '237', 'C', 'o', 't', '4923', '8223', 'Z', '617', 'V', '2651', '8845', '3947', 'i']

17, 6499, 9517, 3, 4935, 3, 237, 3, 15, 20, 4923, 8223, 26, 617, 22, 2651, 8845, 3947, 9