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: ['r', '2215', 'J', '3439', 'K', '5215', '7039', '6103', '2835', '5973', 'i', 'q', 'Y', 'o', '917', 'M', '6015', 'k', '7739', 'c', '327', 'a', '6623']

18, 2215, 10, 3439, 11, 5215, 7039, 6103, 2835, 5973, 9, 17, 25, 15, 917, 13, 6015, 11, 7739, 3, 327, 1, 6623