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: ['6137', '2021', 'X', 'W', 'n', '5615', '3367', 'F', 'K', '6639', 'B', 'y', 'r', '6437', 'b', '5427', '663', '9995', '55', 'W', 'q', 'q', 'k', '4039', '7795', '7873', '319', 'm', 't', 'b', '1173', 'Q', '7975', 'W', '8845', 'g', 'o', 'I', 'f']

6137, 2021, 24, 23, 14, 5615, 3367, 6, 11, 6639, 2, 25, 18, 6437, 2, 5427, 663, 9995, 55, 23, 17, 17, 11, 4039, 7795, 7873, 319, 13, 20, 2, 1173, 17, 7975, 23, 8845, 7, 15, 9, 6