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: ['R', 'S', 'U', 'g', '4805', '1947', 'f', '1675', 'A', 'O', '8633', 'T', 'O', 'h', '4217', '129', 'w', '6977', 'B', 'w', 'x', '9095', 'P', '7569', '8653', '27', 't', 'H', '417']

18, 19, 21, 7, 4805, 1947, 6, 1675, 1, 15, 8633, 20, 15, 8, 4217, 129, 23, 6977, 2, 23, 24, 9095, 16, 7569, 8653, 27, 20, 8, 417