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: ['5707', '9333', 'Z', '5669', 'J', '6989', '8597', '5719', '3861', '6125', '1249', '713', '9767', '5831', 'I', 'N', 'O', 'N', '8423', '9587', '101', '5201', '397', '9003', '129', '6159', 'f', '9257', 'k', '7663', 'r', '5293', '6285', '6663', 'e', '991', 'd', '3457', 'Y']

5707, 9333, 26, 5669, 10, 6989, 8597, 5719, 3861, 6125, 1249, 713, 9767, 5831, 9, 14, 15, 14, 8423, 9587, 101, 5201, 397, 9003, 129, 6159, 6, 9257, 11, 7663, 18, 5293, 6285, 6663, 5, 991, 4, 3457, 25