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: ['7627', '2579', '7721', '5743', '495', '2125', '6585', 'g', 'g', '4059', 'L', '6227', '5477', '67', 'x', 'K', '5321', 'U']

7627, 2579, 7721, 5743, 495, 2125, 6585, 7, 7, 4059, 12, 6227, 5477, 67, 24, 11, 5321, 21