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: ['C', '965', '4033', '1935', 'g', '1061', '9959', 'S', '5121', '8899', '8759', '5173', 'T', '2891', '2631', 'O', 'K', '9141', '8965', '7787', 'J']

3, 965, 4033, 1935, 7, 1061, 9959, 19, 5121, 8899, 8759, 5173, 20, 2891, 2631, 15, 11, 9141, 8965, 7787, 10