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: ['q', 'j', 'U', '4249', 'g', 'l', '4831', '9881', '6693', '4161', 'A', 'R', '5133', 'x', '8631', 'N', 'n', '8113', 't', 'p', '1979']

17, 10, 21, 4249, 7, 12, 4831, 9881, 6693, 4161, 1, 18, 5133, 24, 8631, 14, 14, 8113, 20, 16, 1979