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: ['I', '8041', 'I', 'Y', '253', 'g', '8499', '8185', '5871', '5951', 'n', 'o', 's', 'P', '3277', 'E', 'X', '8081', 'p', 't', '3931', 'Y', 'U', 'f', 'J', 'f']

9, 8041, 9, 25, 253, 7, 8499, 8185, 5871, 5951, 14, 15, 19, 16, 3277, 5, 24, 8081, 16, 20, 3931, 25, 21, 6, 10, 6