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: ['1491', 'V', '6169', 'H', 'W', 'l', '685', '6989', 'w', '119', '6263', 'Z', '3497', '2687', '1121', '7457', '3711', '8567']

1491, 22, 6169, 8, 23, 12, 685, 6989, 23, 119, 6263, 26, 3497, 2687, 1121, 7457, 3711, 8567