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: ['6077', '3175', 'k', 'j', '9065', 'U', 'C', '6239', '7247', '1143', '4459', 'z']

6077, 3175, 11, 10, 9065, 21, 3, 6239, 7247, 1143, 4459, 26