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: ['z', 'u', '1303', 'A', '7405', 'X', 'z', '7297', 'I', '9183', '9781']

26, 21, 1303, 1, 7405, 24, 26, 7297, 9, 9183, 9781