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: ['1039', '6923', 'f', 'n', '3103', 'x', '3977']

1039, 6923, 6, 14, 3103, 24, 3977