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: ['T', '8333', 'C', '829', 'O', '8213', 'x', '5813', 'D', '7915', '6695', '6985', '667', 'R', '8127', '791']

20, 8333, 3, 829, 15, 8213, 24, 5813, 4, 7915, 6695, 6985, 667, 18, 8127, 791