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: ['j', '8417', '5601', 'U', 'o', 'Y', '9403', 'g', '4467', '9149', '933', '783', 'R', '8373']

10, 8417, 5601, 21, 15, 25, 9403, 7, 4467, 9149, 933, 783, 18, 8373