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: ['7703', '8491', '7201', 'T', 'E', '9803', '6033', '8225', '7717', '759', '9503', '7759']

7703, 8491, 7201, 20, 5, 9803, 6033, 8225, 7717, 759, 9503, 7759