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: ['Q', 'l', '4151', '2831', 'l', '4689', '3261', '9613', 'g', '9441', 'Z', '4623', '7219', '6755', '3323', 'K', '1197', 'R', 'G', 'O', 'Y']

17, 12, 4151, 2831, 12, 4689, 3261, 9613, 7, 9441, 26, 4623, 7219, 6755, 3323, 11, 1197, 18, 7, 15, 25