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: ['t', '7949', '2429', '5615', 'y', 'A', '5973', 'W', 'Z', 'O', '4155', '9121', 'T', 's', 'F', '1051', '3615', 'h', '5159', '7043', 'y', '9669', 'U', '9763', 'I', 'H', 'd']

20, 7949, 2429, 5615, 25, 1, 5973, 23, 26, 15, 4155, 9121, 20, 19, 6, 1051, 3615, 8, 5159, 7043, 25, 9669, 21, 9763, 9, 8, 4