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: ['B', '6567', 'r', 'Q', 'O', '5093', 'k', 'I', 'l', '5199', 'r', '4445', 'o', '6115', 'K', '6063', '6455', '3479', '4931', 'd', 't', '8647', '2917', '7723', '8587', 'r', '2645', 'A', '3647', '4475', 'c', '7143']

2, 6567, 18, 17, 15, 5093, 11, 9, 12, 5199, 18, 4445, 15, 6115, 11, 6063, 6455, 3479, 4931, 4, 20, 8647, 2917, 7723, 8587, 18, 2645, 1, 3647, 4475, 3, 7143