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: ['207', '6631', 'M', 'D', '7979', '6595', '541', '1335', 'n', 'Y', 'T', 'f', '9563', 's', '3603', 'k', 'n', 'n', 'v', '2479', 'Z', '3679', 'n', 'G', '9275', '1791', '9543', 'Y', '3677', '5943', '6483']

207, 6631, 13, 4, 7979, 6595, 541, 1335, 14, 25, 20, 6, 9563, 19, 3603, 11, 14, 14, 22, 2479, 26, 3679, 14, 7, 9275, 1791, 9543, 25, 3677, 5943, 6483