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: ['3479', '3639', 'Q', 'N', 'g', 'L', 'v', 't', 'C', '6559', 'q', 'Z', 'S', 'U', '1757', '4993', '8039', '191', '3451', 'b', 'V', '8589', '2559', '4499', '8245', 'T', '5535', '7193', 'B', 'z', '2171', 'G', '9557', '4187', '6199', 'G', 'T', 'U', 'C']

3479, 3639, 17, 14, 7, 12, 22, 20, 3, 6559, 17, 26, 19, 21, 1757, 4993, 8039, 191, 3451, 2, 22, 8589, 2559, 4499, 8245, 20, 5535, 7193, 2, 26, 2171, 7, 9557, 4187, 6199, 7, 20, 21, 3