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: ['o', '379', '4117', '4583', 'b', 'M', 'k', '3021', '8985', 'J', 'f', '8143', 'g', '7321', '7457', '4599', 'l', '7595', '9839', 'O', 'F', 'p', '845', 'N', 'K', 'r', '3845', 'H', '1871']

15, 379, 4117, 4583, 2, 13, 11, 3021, 8985, 10, 6, 8143, 7, 7321, 7457, 4599, 12, 7595, 9839, 15, 6, 16, 845, 14, 11, 18, 3845, 8, 1871