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: ['p', '4969', 'C', 'G', 'D', 'R', '5533', '2339', 'U', 'J', '3921', 'q', 'g', 'I', 'K', '6947', '5765', '9579', '6323', '7169', 'M', 'q', '435', 'v']

16, 4969, 3, 7, 4, 18, 5533, 2339, 21, 10, 3921, 17, 7, 9, 11, 6947, 5765, 9579, 6323, 7169, 13, 17, 435, 22