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: ['U', 'o', 'c', 'U', '5249', '7199', 'N', '929', '3495', '1563', 'l', '1493', 'd', '9229', 'K', '9099', '4941', 'x', '5749', 'w', '8153', 'p', 'N', '2373']

21, 15, 3, 21, 5249, 7199, 14, 929, 3495, 1563, 12, 1493, 4, 9229, 11, 9099, 4941, 24, 5749, 23, 8153, 16, 14, 2373