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: ['6557', '9481', '8095', 'M', '7859', '7293', 'w', 'w', '3937', '3719', '1875', '375', '799', '3077', '5255', '8895', 'D', 'z', '7395', '7461', '2317', '2717', 'U', 'A', 'h', '1801', 'y', 'v', 'Z', 'v', '3073', 'G', 'd', '833', 'R', 'S']

6557, 9481, 8095, 13, 7859, 7293, 23, 23, 3937, 3719, 1875, 375, 799, 3077, 5255, 8895, 4, 26, 7395, 7461, 2317, 2717, 21, 1, 8, 1801, 25, 22, 26, 22, 3073, 7, 4, 833, 18, 19