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: ['2887', 'o', 'l', 'g', 'u', '4333', '3687', 'd', 'n', 'v', 'x', 'L', '6573', 'g', 'p', '815', 'z', '9693', 'Y', 'e', '491', '5135', 'r', '4343', '3943', '8739', '4969', 'G', 'W', '229', '4131', 'P', '4625', '5431', '2893', 'S']

2887, 15, 12, 7, 21, 4333, 3687, 4, 14, 22, 24, 12, 6573, 7, 16, 815, 26, 9693, 25, 5, 491, 5135, 18, 4343, 3943, 8739, 4969, 7, 23, 229, 4131, 16, 4625, 5431, 2893, 19