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', '5941', '3291', 'C', '4035', '5495', 'G', '9529', 'x', '6029', '6503', 'z', 'K']

2, 5941, 3291, 3, 4035, 5495, 7, 9529, 24, 6029, 6503, 26, 11