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: ['N', 'Y', 'y', 'i', '5913', 'r', '7457', 'S', '6297', '6307', 'D', 'Q', '3933']

14, 25, 25, 9, 5913, 18, 7457, 19, 6297, 6307, 4, 17, 3933