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: ['9935', '3309', '5413', '1951', 'u', 'f', 'K', 'c', 'M', 'c', 'g', '2161', 'F', 'I', '7421', 'O', 'l', '7561', '6391', '9503', 'G', '5603', 'f', '4477', 'G', 'M', 'P', 'n', 't', 'x', 'z']

9935, 3309, 5413, 1951, 21, 6, 11, 3, 13, 3, 7, 2161, 6, 9, 7421, 15, 12, 7561, 6391, 9503, 7, 5603, 6, 4477, 7, 13, 16, 14, 20, 24, 26