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: ['7139', '6025', 'U', '9741', '989', '7143', 'Q', 'T', '5855', 'v', '8569', 'K', 'I', 'U', '119', '4199', 'I', '5825', '503', '4793', '1369', 'Z']

7139, 6025, 21, 9741, 989, 7143, 17, 20, 5855, 22, 8569, 11, 9, 21, 119, 4199, 9, 5825, 503, 4793, 1369, 26