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: ['8067', 'v', 'D', '339', '4121', '645', '5679', '2643', '9347', 'G', '1765', 'u', 'U', 'K', '4955']

8067, 22, 4, 339, 4121, 645, 5679, 2643, 9347, 7, 1765, 21, 21, 11, 4955