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: ['6437', '3375', '6529', 'G', '3351', '5563', '5349', '4505', 'V', 'l', '2255', 's', '3691', 'c', 'w']

6437, 3375, 6529, 7, 3351, 5563, 5349, 4505, 22, 12, 2255, 19, 3691, 3, 23