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: ['897', '9419', '7583', 'R', 'c', '5277', '8205', 'M', '217', '6735', '7011', 'i', 's', 'c']

897, 9419, 7583, 18, 3, 5277, 8205, 13, 217, 6735, 7011, 9, 19, 3