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: ['981', 'm', 'f', '6343', 'D', 's', 'Q', '1965', '7855', '403', 'a', '3515', '5357', 'E', 's', '8213', 'G', 'I', 'F', 'M', 'Z', '5441', '9493', 'Z', '9329', 'U', 'p', '9219', '73', 'Z', 'o', 'd']

981, 13, 6, 6343, 4, 19, 17, 1965, 7855, 403, 1, 3515, 5357, 5, 19, 8213, 7, 9, 6, 13, 26, 5441, 9493, 26, 9329, 21, 16, 9219, 73, 26, 15, 4