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: ['G', '5531', 'z', 'O', 'k', 'V', '247', '2041', 'y', '8869', 'Q', '5659', 'l', '2695', 'D']

7, 5531, 26, 15, 11, 22, 247, 2041, 25, 8869, 17, 5659, 12, 2695, 4