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.

['6967', '5011', 'C', '23', 'L', 'a', 's', 'F', 'b', 'O', 'p', '8353', 'p', 'x', 'e', 'c', '4237', 'k', 'l', '4335', 'u', 'd', 'n', 'A', '1521', 'F', '6219', '8057', 'K', 'h', 'I', '1397', 'd', 'f', 'b', '9645', 'r', 't', 'p', '6321']
6967, 5011, 3, 23, 12, 1, 19, 6, 2, 15, 16, 8353, 16, 24, 5, 3, 4237, 11, 12, 4335, 21, 4, 14, 1, 1521, 6, 6219, 8057, 11, 8, 9, 1397, 4, 6, 2, 9645, 18, 20, 16, 6321