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: ['I', 'D', 'X', 'x', 'M', 'j', '3147', 'n', 'v', '8479', 'y', '8661', '6161', '7735', 'q', 'P', 'l', '6947', '4653', 'x', 'A', '579', '3829', '9009', '9073', '1007', '6037', 'l', '1313', 'G', '4647', 'D', 'Z']

9, 4, 24, 24, 13, 10, 3147, 14, 22, 8479, 25, 8661, 6161, 7735, 17, 16, 12, 6947, 4653, 24, 1, 579, 3829, 9009, 9073, 1007, 6037, 12, 1313, 7, 4647, 4, 26