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: ['1721', 'C', 'h', '9555', 'v', 'C', 'j', '413', 'X', '2839', 'a', 'F', 'X', '463', '7479', '8595', 'Q', '95', '9673', 'C', '5605', '4045', '4127', '9077', 'l', 'I', '7849', '8521', 'Q', '9623', '8439', '7211', '3447', '7725', 'l']

1721, 3, 8, 9555, 22, 3, 10, 413, 24, 2839, 1, 6, 24, 463, 7479, 8595, 17, 95, 9673, 3, 5605, 4045, 4127, 9077, 12, 9, 7849, 8521, 17, 9623, 8439, 7211, 3447, 7725, 12