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: ['r', 'S', 'v', 'P', 'd', 'd', '6173', '629', '2325', '835', 'M', 'n', 'R', 'R', 'l', 'j', '399', '7771', '8289', 'T', '463', 's', 'W', 'F', 'U', 'I', '2807', '6625', 'n', 'q', 'U', 'k', 'n', 'z', '1937', '9657', '3559']

18, 19, 22, 16, 4, 4, 6173, 629, 2325, 835, 13, 14, 18, 18, 12, 10, 399, 7771, 8289, 20, 463, 19, 23, 6, 21, 9, 2807, 6625, 14, 17, 21, 11, 14, 26, 1937, 9657, 3559