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: ['t', 'd', 'I', '8129', '2725', 'x', '7295', '4181', 'W', '5833', '7041', 'v', '6055', '3267', '5697', 'y', 'l', 'q', '6375', 'f', '8847', 'r', '9907', 'B', 'k', 'Z', 'N', 'S', 'J', 'h', 'O', '1671']

20, 4, 9, 8129, 2725, 24, 7295, 4181, 23, 5833, 7041, 22, 6055, 3267, 5697, 25, 12, 17, 6375, 6, 8847, 18, 9907, 2, 11, 26, 14, 19, 10, 8, 15, 1671