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: ['l', 'R', '7583', '7233', '6011', '6157', 'Q', 'x', '273', 'Q', 'Y', '7533', '3737', 'G', 'S', '5131', '941']

12, 18, 7583, 7233, 6011, 6157, 17, 24, 273, 17, 25, 7533, 3737, 7, 19, 5131, 941