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: ['1807', 'G', '6675', '6659', '8863', 'e', '1355', '4265', 'c', 'u', '6281', '1163', 'Y', 'y', '5349', 'J', '2979', 'J']

1807, 7, 6675, 6659, 8863, 5, 1355, 4265, 3, 21, 6281, 1163, 25, 25, 5349, 10, 2979, 10