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: ['U', 'C', 'B', '9725', 'd', '5367', 'E', '7217', '7433', 'K', '4017', 'v', '5209', 'm', '1671', '3697', '6765', '8161', 'G', '5147', 'p', 'p', 'K', 'G', 'F', 'l', 'Z']

21, 3, 2, 9725, 4, 5367, 5, 7217, 7433, 11, 4017, 22, 5209, 13, 1671, 3697, 6765, 8161, 7, 5147, 16, 16, 11, 7, 6, 12, 26