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: ['3059', '4039', 'c', 'R', '7329', 'm', 'E', 'R', '1231', '6861', '29']

3059, 4039, 3, 18, 7329, 13, 5, 18, 1231, 6861, 29