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: ['w', '43', 'T', 'K', 'x', 'H', 'L', '1129', 'j', 'o', '2939', '1149', '3221', 'C', '7491', 'F', 't']

23, 43, 20, 11, 24, 8, 12, 1129, 10, 15, 2939, 1149, 3221, 3, 7491, 6, 20