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: ['7389', 'f', '4357', '1269', 'x', '5111', '451', 'R', 'I', '1175', '8341', 'o', 'e', 'D', '2675', '3525', '9511', '9349', '1655', '8639', '3701', '3889', '3643', '9359', '1913', 'b', '6831', 'X', 's']

7389, 6, 4357, 1269, 24, 5111, 451, 18, 9, 1175, 8341, 15, 5, 4, 2675, 3525, 9511, 9349, 1655, 8639, 3701, 3889, 3643, 9359, 1913, 2, 6831, 24, 19