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: ['u', 'V', 'Y', 'a', '7981', 'C', '6263', '8407', 'k', 'I', 'P', 'n', '7323', 'l', '9685', 'N', 'H', '3667', 'H', '4131', 'O', '5403', '2039', 'p']

21, 22, 25, 1, 7981, 3, 6263, 8407, 11, 9, 16, 14, 7323, 12, 9685, 14, 8, 3667, 8, 4131, 15, 5403, 2039, 16