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: ['6107', 'L', 'P', '2897', 'T', 's', '6433', '1839', 'J', '7337', '2471', '53', '3813', '2427', '8593', '2367', '1779', '993', '5559', 'Y']

6107, 12, 16, 2897, 20, 19, 6433, 1839, 10, 7337, 2471, 53, 3813, 2427, 8593, 2367, 1779, 993, 5559, 25