TASK 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.
PROBLEM: ['3281', '6057', 'g', 'C', '5137', 'Q', 'N', 'n', '5121', '5599', '1281', '3473', 'q', '9141', 'v', 'Y', 'K', '2653', 'f']

SOLUTION: 3281, 6057, 7, 3, 5137, 17, 14, 14, 5121, 5599, 1281, 3473, 17, 9141, 22, 25, 11, 2653, 6

PROBLEM: ['5671', 'O', 'r', '2473', '9907', '9515', '9817', 'E', '5479', 'G', '6493', '7015']

SOLUTION: 5671, 15, 18, 2473, 9907, 9515, 9817, 5, 5479, 7, 6493, 7015

PROBLEM: ['m', 'y', 'Y', 'O', '6759', 'r', 'v']

SOLUTION:
13, 25, 25, 15, 6759, 18, 22