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: ['g', '6415', 'P', 'S', '9527', '1483', 'W', 'B', 'B', '7627', '1917', 'x', 'n', 'f', '8461', 'T', '3671', 'h', 'E', '1517', '3129', 'K', 'X', '5603', 'Q', 'b', 'a', '3251']

7, 6415, 16, 19, 9527, 1483, 23, 2, 2, 7627, 1917, 24, 14, 6, 8461, 20, 3671, 8, 5, 1517, 3129, 11, 24, 5603, 17, 2, 1, 3251