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: ['Y', '1917', 'P', 'u', '5669', '2769', 'z', '7113', '1139', '4591', 'i', 'E', '5673', 'C', 'J', 'A', 'c', 'd', '9351', '3935', '2991', '931', 'K', '7149', '3971', 'a', 'G', '3749', '1481', '4115', 'T', 'b', '2457', '2117', '585', '3217', 'W']

25, 1917, 16, 21, 5669, 2769, 26, 7113, 1139, 4591, 9, 5, 5673, 3, 10, 1, 3, 4, 9351, 3935, 2991, 931, 11, 7149, 3971, 1, 7, 3749, 1481, 4115, 20, 2, 2457, 2117, 585, 3217, 23