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: ['2475', '9035', '6869', '7079', 'l', 'p', 'f', 'S', 'r', 'y', '413', '2877', '4989', 'h', 'L', '173', 'e', '2141', 'B', 'U', '3195', '7679', '3367', 'O', 'X', 'E', '1961', 'M', '6505', '4079', '7113', '8189', '4705', '9013', '3531', '2729', 'p']

2475, 9035, 6869, 7079, 12, 16, 6, 19, 18, 25, 413, 2877, 4989, 8, 12, 173, 5, 2141, 2, 21, 3195, 7679, 3367, 15, 24, 5, 1961, 13, 6505, 4079, 7113, 8189, 4705, 9013, 3531, 2729, 16