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: ['Y', 'L', '5267', '2391', 'R', '267', 'E', 'C', 'j', '5561', 'm', 'c', '5221', '1063', '273', 'T', 'g', 'i', 'm', '2599', 'B', 'O', '233', 'v', '1655', 'p', '3627', '4795', 'x', 'M', '1259', '5565']

25, 12, 5267, 2391, 18, 267, 5, 3, 10, 5561, 13, 3, 5221, 1063, 273, 20, 7, 9, 13, 2599, 2, 15, 233, 22, 1655, 16, 3627, 4795, 24, 13, 1259, 5565