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: ['1391', 'V', '1111', '1969', 'z', '2017', 'K', 'C', '9359']

1391, 22, 1111, 1969, 26, 2017, 11, 3, 9359