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: ['453', '9533', 'i', '9125', 'q', 'y', 'p', '5003', 'n', 'e', 's', '1003', 'k', '605', '7081', 'f', '3039', 'E', 'D', '9139', 'U', 'r', '7897', 'K', 'D', '7729', 'j', '3499', 'r', '1831', '7271', 'V', '8819', '1713', 'O', '6853', 'e', '691']

453, 9533, 9, 9125, 17, 25, 16, 5003, 14, 5, 19, 1003, 11, 605, 7081, 6, 3039, 5, 4, 9139, 21, 18, 7897, 11, 4, 7729, 10, 3499, 18, 1831, 7271, 22, 8819, 1713, 15, 6853, 5, 691