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: ['1517', '7071', '2429', 'f', '3843', 'Q', 'p', 'A', '9473', 'T']

1517, 7071, 2429, 6, 3843, 17, 16, 1, 9473, 20