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: ['455', '8627', 'u', 'r', 'N', 'n', 'x', 'P', '6779', 'h', '2375', 'm', 'C', '7463', '4097', '1335', 'g', '9887', '5481', '8791', '7675', '1373', 'M', '8219', 'z', '4843', '6509', 'X', '5613', 'W']

455, 8627, 21, 18, 14, 14, 24, 16, 6779, 8, 2375, 13, 3, 7463, 4097, 1335, 7, 9887, 5481, 8791, 7675, 1373, 13, 8219, 26, 4843, 6509, 24, 5613, 23