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.
Q: ['2583', '7413', '2143', 'S', '4073', '5549']
A: 
2583, 7413, 2143, 19, 4073, 5549