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: ['7147', '3631', 'C', '6879', 'T', 'T', 'U', 'h', 'V', 'V', 'e', '8153', '2917', 'v', 'x', '2381', '6605', 'l', 'c']

7147, 3631, 3, 6879, 20, 20, 21, 8, 22, 22, 5, 8153, 2917, 22, 24, 2381, 6605, 12, 3