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: ['H', '7591', 'v', 'H', '5351', '4081', '8025', 'i', 'H', '3213', '4441', 'x', '8991', '3767', 'f', '6227', 'l']

8, 7591, 22, 8, 5351, 4081, 8025, 9, 8, 3213, 4441, 24, 8991, 3767, 6, 6227, 12