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: ['7161', '6457', '1657', 'U', '7781', '925', '9429', 'f', '2871', 'x', 'K', 'c', 'E', 'w', 'L', '6171']

7161, 6457, 1657, 21, 7781, 925, 9429, 6, 2871, 24, 11, 3, 5, 23, 12, 6171