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: ['5467', 'z', '665', '1099', '5841', 't', 'G', 'm', 'v']

5467, 26, 665, 1099, 5841, 20, 7, 13, 22