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: ['m', '5255', '9703', 'o', '8937', 'a', '5789', '3043', '9693', 'x', '2633', 'M', 'j', 's', 'K', 'B', 'N', 'R', '5273', '965']

13, 5255, 9703, 15, 8937, 1, 5789, 3043, 9693, 24, 2633, 13, 10, 19, 11, 2, 14, 18, 5273, 965