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: ['A', 'G', 'J', 'a', '1765', '2455', 'L', '2603', 'd', '3435', 'X', '131', 'Y', 'K', '2371', 'A', 't', '1127', 'o', 'C', 'M', '5651', '6227', '1329', '6399', '975', '7671', 'C', '1941', 'F', '8109', '2615', 'd']

1, 7, 10, 1, 1765, 2455, 12, 2603, 4, 3435, 24, 131, 25, 11, 2371, 1, 20, 1127, 15, 3, 13, 5651, 6227, 1329, 6399, 975, 7671, 3, 1941, 6, 8109, 2615, 4