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: ['A', 'S', 'C', 'P', 'm', 'G', '7659', '7621', 'M', 'O', '9075', 'P', 'D', '6717', '5479', 'V', '2927', 'M', 'z', 'C', 'F', '6995', 'n', 'l', '5809', '247', 'K', '6421', 'M', '5691']

1, 19, 3, 16, 13, 7, 7659, 7621, 13, 15, 9075, 16, 4, 6717, 5479, 22, 2927, 13, 26, 3, 6, 6995, 14, 12, 5809, 247, 11, 6421, 13, 5691