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: ['2967', 'U', 'f', '4675', 'b', '3077', '2917', 'T', 'H', '2677', '1041', 'E', 'Q', 'c', 'p', '867', 'e', '6757', 'I', 'Z', 'r', 'H', '9115']

2967, 21, 6, 4675, 2, 3077, 2917, 20, 8, 2677, 1041, 5, 17, 3, 16, 867, 5, 6757, 9, 26, 18, 8, 9115