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: ['1851', '6873', 'q', 'P', 'V', '5171', '3181', '4697']

1851, 6873, 17, 16, 22, 5171, 3181, 4697