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: ['K', 'j', 'Z', '8255', '6147', '1449', '7555', 'b', 'n', '6023', '3685', 'n', '7791', '5205', 'g', '997', 'G', '2631', 'i', '4587']

11, 10, 26, 8255, 6147, 1449, 7555, 2, 14, 6023, 3685, 14, 7791, 5205, 7, 997, 7, 2631, 9, 4587