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: ['Y', 'D', '9175', 'f', 'i', '8739', 'r', '2175', '1605', '6357', '1499', '7237', '6413', '957', '8919', '3097', '37', '9779', 'x', 'y', 'I', '7693', 'v', 'D', 'U', '7901', 'r', 'f', '7339', 's', '4157', '6605']

25, 4, 9175, 6, 9, 8739, 18, 2175, 1605, 6357, 1499, 7237, 6413, 957, 8919, 3097, 37, 9779, 24, 25, 9, 7693, 22, 4, 21, 7901, 18, 6, 7339, 19, 4157, 6605