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: ['W', '1997', '67', 'z', '5849', '2989', 'U', 'L', '1099', 'E', 'x', '7717', '3059', 'O', '8923', '7379', '8605', 'l', '1885', '3407', 'v', '1913', 'v']

23, 1997, 67, 26, 5849, 2989, 21, 12, 1099, 5, 24, 7717, 3059, 15, 8923, 7379, 8605, 12, 1885, 3407, 22, 1913, 22