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: ['8403', '6167', 'x', 'u', 'A', '2077', '3015', '1557', 'L', 'd', 'c', '1783', 'B', 'Y', 's', '2753', 'S', 'X', '5177', '663', 'r', '7749', 'V', 'x', 'N', 'I', 'd']

8403, 6167, 24, 21, 1, 2077, 3015, 1557, 12, 4, 3, 1783, 2, 25, 19, 2753, 19, 24, 5177, 663, 18, 7749, 22, 24, 14, 9, 4