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: ['3535', '4013', 'D', '8235', 'Y', 'r', 'Z', '5537', 'l', 'P', 'l', 'o', 'c', 'k', 'G']

3535, 4013, 4, 8235, 25, 18, 26, 5537, 12, 16, 12, 15, 3, 11, 7