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: ['3867', '1103', '7413', 'a', 'f', '2611', '7555', '6993', 'h', '2039', '1011', 'x', '69', '6167', '7915', '3517', '9835', '5395', '383', 'U', '5225', 'V', 's']

3867, 1103, 7413, 1, 6, 2611, 7555, 6993, 8, 2039, 1011, 24, 69, 6167, 7915, 3517, 9835, 5395, 383, 21, 5225, 22, 19