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: ['6147', '7677', 'v', '3999', '3113', '8971', 'd', '3463', 'N', '8999', '3255', '1145', 'h', '9247', 'X', '3115', '4525', '353', 'd', 'l', '8523', '1799', '9933', 'Y', '2559', '4849', 'x']

6147, 7677, 22, 3999, 3113, 8971, 4, 3463, 14, 8999, 3255, 1145, 8, 9247, 24, 3115, 4525, 353, 4, 12, 8523, 1799, 9933, 25, 2559, 4849, 24