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: ['P', 'I', 's', 'Z', 'a', '779', '6331', '8395', '6613', '8077', 'O', 'K', '9665', '9913', '9265', 'k', 'x', 'n', '2941', '3553', '907', '3273']

16, 9, 19, 26, 1, 779, 6331, 8395, 6613, 8077, 15, 11, 9665, 9913, 9265, 11, 24, 14, 2941, 3553, 907, 3273