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: ['S', '7013', '7649', 'S', '1963', '9057', 't', '5033', 'z', '4785', '4171', 'X', '3035', '3331', '8695', '8465', 'f', '9491', '6787', 'o', '9243', 'a', '5271', '3229', 'i', 'Q', 'G']

19, 7013, 7649, 19, 1963, 9057, 20, 5033, 26, 4785, 4171, 24, 3035, 3331, 8695, 8465, 6, 9491, 6787, 15, 9243, 1, 5271, 3229, 9, 17, 7