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: ['2139', 'z', 'N', 'Z', '6757', '7629', '7753', '8725', 'K', 'l', 'J', '9747', 'E', 'y', 'F', '6617', 'n', 'X', 'M', '7607', '8683', 'Z', '2559', 'v', '95', '9245', 'F', 'g', '3717', '855', 'k', '83', 'w', 'd', 'N', 't']

2139, 26, 14, 26, 6757, 7629, 7753, 8725, 11, 12, 10, 9747, 5, 25, 6, 6617, 14, 24, 13, 7607, 8683, 26, 2559, 22, 95, 9245, 6, 7, 3717, 855, 11, 83, 23, 4, 14, 20