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: ['B', '3571', 'X', '7917', 'G', 'Z', 'w', 'T', 'D', 'T', 'c', '5197', '3847', '3459', 'y', '6805', '7487', 't', '7503', 'd', 'k']

2, 3571, 24, 7917, 7, 26, 23, 20, 4, 20, 3, 5197, 3847, 3459, 25, 6805, 7487, 20, 7503, 4, 11