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: ['B', '8483', '2679', '6367', 'T', 'T', 's', 'q', '8923', 'u', '2475', '7147', 'b']

2, 8483, 2679, 6367, 20, 20, 19, 17, 8923, 21, 2475, 7147, 2