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: ['7291', '1667', 'd', '9427', 'n', 'A', 'A', 'H', 'n', '1473', '4627', 'u', '949', 'x', 'F', 'Y', 't', '815', '6579', '6385', '8201', '4927', '499', '3365', 'Y', 'm', 'Y', '8459', '8355', 'U', '8623', '869', '1453', '3745', '2975', 'v']

7291, 1667, 4, 9427, 14, 1, 1, 8, 14, 1473, 4627, 21, 949, 24, 6, 25, 20, 815, 6579, 6385, 8201, 4927, 499, 3365, 25, 13, 25, 8459, 8355, 21, 8623, 869, 1453, 3745, 2975, 22