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: ['A', 'O', '5835', 'A', 'r', '3869', '5945', 'y', 'P', '4823', '7185', '7929', 'X', '2903', '6455', '2285', 'F', 'T', 'v', 'Y', 'm', '8747', '5417', 'c', '7499', '6653', '4221', 'T']

1, 15, 5835, 1, 18, 3869, 5945, 25, 16, 4823, 7185, 7929, 24, 2903, 6455, 2285, 6, 20, 22, 25, 13, 8747, 5417, 3, 7499, 6653, 4221, 20