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: ['909', 'J', '3355', '4231', '3955', 'K', '5307', 'r', '2325', '4009', 'f', '7299', 't', '6363', 'y', '4915', 'a', '9971', '1745', '4579', '2037', 'N', 'i', 'J', 'Y', '7709', '6927', '3059']

909, 10, 3355, 4231, 3955, 11, 5307, 18, 2325, 4009, 6, 7299, 20, 6363, 25, 4915, 1, 9971, 1745, 4579, 2037, 14, 9, 10, 25, 7709, 6927, 3059