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: ['8147', '6055', '4781', '8061', 'l', '7453', '1615', '4881', '71', 'y', 'Q', '8783', '2345', 'a', '4235', '5881', 'L', '8853', 'I', 'i', '5383', '6169', '3461', '163', '9865']

8147, 6055, 4781, 8061, 12, 7453, 1615, 4881, 71, 25, 17, 8783, 2345, 1, 4235, 5881, 12, 8853, 9, 9, 5383, 6169, 3461, 163, 9865