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: ['3319', 'f', 'G', '1747', '4819', '6549', '2365', '7831', 'H']

3319, 6, 7, 1747, 4819, 6549, 2365, 7831, 8