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: ['8479', 'r', '1955', 'K', '3617', 'K', '743', 'e', '8841', '6073', 'a', 'U', 'P', '8539', 'u', 'v', 'V']

8479, 18, 1955, 11, 3617, 11, 743, 5, 8841, 6073, 1, 21, 16, 8539, 21, 22, 22