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: ['C', '4759', 'u', '9811', '9473', 'a', '1631', '8267', '8241', '9375', '6207', 'V', 'T', 'j', '5819', 'Y', '2833', 'U', 'F', 'g', 'V', '735', '1849', 'E', 'O', 'Y', 'R', '8083', 'U', 'K', 't', 'S', 'c', 'S', '3129', 'q', '8983', '163', 'Y', 'f']

3, 4759, 21, 9811, 9473, 1, 1631, 8267, 8241, 9375, 6207, 22, 20, 10, 5819, 25, 2833, 21, 6, 7, 22, 735, 1849, 5, 15, 25, 18, 8083, 21, 11, 20, 19, 3, 19, 3129, 17, 8983, 163, 25, 6