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: ['7719', 'u', '8611', 'v', 'f', 'C', '2769', 's', '8875', '4917', '1673', 'w', 'n']

7719, 21, 8611, 22, 6, 3, 2769, 19, 8875, 4917, 1673, 23, 14