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: ['6615', 'z', '289', 'l', 't', '6335', '4187', 'X', 'j', 'I', 'b', 'e', 'x', 'N', '8147', '2717', '2265', '4571', '2491', '4133', '7143', '9065', '7847', 'Q', '9061', 'Y', '3333', 'x', '7995', '3273', '1809', '6615', 'b', '2151', '7933', '8639']

6615, 26, 289, 12, 20, 6335, 4187, 24, 10, 9, 2, 5, 24, 14, 8147, 2717, 2265, 4571, 2491, 4133, 7143, 9065, 7847, 17, 9061, 25, 3333, 24, 7995, 3273, 1809, 6615, 2, 2151, 7933, 8639