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: ['R', 'p', 'k', '1833', '4871', 's', 'H', '7119', 'l', '505', '2583', 'O', 'm', '4493', '3099', '2363', 's', 'Y', 'M', 'm', 's', 'k', '6563', 'v', '3007']

18, 16, 11, 1833, 4871, 19, 8, 7119, 12, 505, 2583, 15, 13, 4493, 3099, 2363, 19, 25, 13, 13, 19, 11, 6563, 22, 3007