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: ['v', 'i', '3141', 'z', 'o', 'f', '7815', 'g', '8009', 'd', 'K', '3449', 'o', '4921', 'z', '1859', '7269', '1291', 'P']

22, 9, 3141, 26, 15, 6, 7815, 7, 8009, 4, 11, 3449, 15, 4921, 26, 1859, 7269, 1291, 16