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: ['d', 'f', 'C', '5453', 'K', '7583', 'U', 'C', '2855', '2557', '4931', '8865', '5041', 'd', 'U', 'n', 'j', '4029', 'F', 'L', 'c', '9361', '1545', 'K', 'b']

4, 6, 3, 5453, 11, 7583, 21, 3, 2855, 2557, 4931, 8865, 5041, 4, 21, 14, 10, 4029, 6, 12, 3, 9361, 1545, 11, 2