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: ['4873', 'R', '6917', '9145', 'F', 's', '4875', '4603', 'u', '7329', '3123', '5349', 'q', '9729', '403', '5317', 'j', '4093', '7455', '3433', '8353', 'S', 'F', '3695', 'W', '4205', '4919', 'w', '9059', 'p', 'M', 'i', '8745', '5761', 'g', '4627', 'A', 'f', '4505', '2337']

4873, 18, 6917, 9145, 6, 19, 4875, 4603, 21, 7329, 3123, 5349, 17, 9729, 403, 5317, 10, 4093, 7455, 3433, 8353, 19, 6, 3695, 23, 4205, 4919, 23, 9059, 16, 13, 9, 8745, 5761, 7, 4627, 1, 6, 4505, 2337