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: ['c', '2955', 'o', '2521', '4905', 'W', '1817', 'o', 'k', 'w', 'i', '4339', 'z', '5581']

3, 2955, 15, 2521, 4905, 23, 1817, 15, 11, 23, 9, 4339, 26, 5581