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: ['H', 'c', '9841', '5663', 'd', '4827', 'V', '2387', 's', 'l', '669', 'h', 'B', 'p', 'g', '3905', 'Q', 'F', '1435', '1907', 'Z', '821', '6229', 'F', '2419', 'X', '7973', 'p', '5839', '4621', 'D', '7119', 'U', 'k']

8, 3, 9841, 5663, 4, 4827, 22, 2387, 19, 12, 669, 8, 2, 16, 7, 3905, 17, 6, 1435, 1907, 26, 821, 6229, 6, 2419, 24, 7973, 16, 5839, 4621, 4, 7119, 21, 11