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: ['b', 's', '8619', 's', '9479', '9081', 'F', '8967', '2903', 'a', 'x', '2335', '1539', 'd', '713', 'G', '6945', '5479', '3809']

2, 19, 8619, 19, 9479, 9081, 6, 8967, 2903, 1, 24, 2335, 1539, 4, 713, 7, 6945, 5479, 3809