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: ['4465', 'H', '9355', '3679', '3597', '3999', '2587', '4355', '2459', '4957', '4111', 'O', 'G', '7417', '7855', 'U']

4465, 8, 9355, 3679, 3597, 3999, 2587, 4355, 2459, 4957, 4111, 15, 7, 7417, 7855, 21