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', 'l', 'Q', '4267', 'X', '5501', 'R', 'e', 'K', 'C', 'v', '2475', '2503', 'z', 'Y', '2763', 'k', 'I']

2, 12, 17, 4267, 24, 5501, 18, 5, 11, 3, 22, 2475, 2503, 26, 25, 2763, 11, 9