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', '9377', '2097', '5467', '1281', 'J', 'u', 'V', '5893', '5083', 'I', 'U', 'D', 't', '3361', 'u', '8185', '3395', 'A', 'g', 'g', '9167', 'm']

7139, 9377, 2097, 5467, 1281, 10, 21, 22, 5893, 5083, 9, 21, 4, 20, 3361, 21, 8185, 3395, 1, 7, 7, 9167, 13