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: ['7063', 'Z', '5209', '3499', '1141', 'u', 's', 'E', 'c', 'Y', '3477', '9833', 'p', 'N', '4947', '915', 'I', 'd', 'b', '9451', 'p', 'U', '663', '7619']

7063, 26, 5209, 3499, 1141, 21, 19, 5, 3, 25, 3477, 9833, 16, 14, 4947, 915, 9, 4, 2, 9451, 16, 21, 663, 7619