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: ['N', '8675', 'U', '8719', '9363', '9175', '347', '7139', 'v', 'N', 'U', 'h']

14, 8675, 21, 8719, 9363, 9175, 347, 7139, 22, 14, 21, 8