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: ['A', 'Q', 'o', 'U', '5301', 'W', '9261', '8153', 'K', 'v', 'g', '4399']

1, 17, 15, 21, 5301, 23, 9261, 8153, 11, 22, 7, 4399