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: ['5489', 'x', '8207', 'u', '2955', 'k', 'r', '7187', '2925', 'f']

5489, 24, 8207, 21, 2955, 11, 18, 7187, 2925, 6