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', '5687', '3203', 'Z', 'T', 'C', 'M', 'r', '8693', '2651', '8183', 'g', 'I', '6481', 'z', '1891', '6145', 'y', '3671', 'T', '7813', 'e', '767', 'r', '9103', 'h', '7431', '8615', 'J', 'j', 'E', 'l', '929', 'L', 'a', 'd', '2221', '8261']

21, 5687, 3203, 26, 20, 3, 13, 18, 8693, 2651, 8183, 7, 9, 6481, 26, 1891, 6145, 25, 3671, 20, 7813, 5, 767, 18, 9103, 8, 7431, 8615, 10, 10, 5, 12, 929, 12, 1, 4, 2221, 8261