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: ['9371', 'r', 'h', '1751', 'W', 'E', '4821', 'B', '2085', '2899', '6669', 'f', 'Y', '3767', '1255', '7747', 'k', 'e', 'U', '6463', '6081']

9371, 18, 8, 1751, 23, 5, 4821, 2, 2085, 2899, 6669, 6, 25, 3767, 1255, 7747, 11, 5, 21, 6463, 6081