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: ['2807', '235', 'r', '1107', 'j', '3473', '4769', '3227', 'H', 'L', '6571', '7555', 'x', '3297']

2807, 235, 18, 1107, 10, 3473, 4769, 3227, 8, 12, 6571, 7555, 24, 3297