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: ['n', '2977', 'I', '3291', '3213', '6237', 'S', 'C', '7385', 'C', 'R', 'f', 'K', '8931', 'h', '4791', '6881', '8557', '385', '5463', 'e']

14, 2977, 9, 3291, 3213, 6237, 19, 3, 7385, 3, 18, 6, 11, 8931, 8, 4791, 6881, 8557, 385, 5463, 5