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: ['7419', 'x', '6853', 'B', 'Y', 'f', '2781', 'N', '4405', 'H', '8291', 'B', 'T', '663', 'Y', 'l', '8781', 'z', '8185', 'N', '6301', 'X', '7793', 'v', 'E', 'n', '3287', 'b', 'K', '3491', '3763', '2481', '5959', '9851', 's']

7419, 24, 6853, 2, 25, 6, 2781, 14, 4405, 8, 8291, 2, 20, 663, 25, 12, 8781, 26, 8185, 14, 6301, 24, 7793, 22, 5, 14, 3287, 2, 11, 3491, 3763, 2481, 5959, 9851, 19