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: ['9519', 'Q', 'M', '2807', '6475', '8527', '9053', 'X', 'X', '7299', 'O', '209', '7979', 'G', 'y', '4385', '755', '2337', 'D', '9191', 'Z', '6437', 'u', 'l', 'h', '1825', 'c', '697', '9775', 'y', 'J']

9519, 17, 13, 2807, 6475, 8527, 9053, 24, 24, 7299, 15, 209, 7979, 7, 25, 4385, 755, 2337, 4, 9191, 26, 6437, 21, 12, 8, 1825, 3, 697, 9775, 25, 10