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: ['4435', '6007', 'z', 'i', '5483', 'a', 'f', '969', '5287', '5511']

4435, 6007, 26, 9, 5483, 1, 6, 969, 5287, 5511