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: ['F', '1119', '7743', '277', '1435', 'K', 'W', 'I', '925', 'P', 'O']

6, 1119, 7743, 277, 1435, 11, 23, 9, 925, 16, 15