The user will be presented with a menu. The options will be listed as calculate maximum in option 1, calculate minimum in option 2, calculate average in option 3, calculate total in option 4, calculate absolute value in option 5. After the list items have been taken from the user, the user will be asked to choose one of these options. A separate function should be created for each option. In the function input, the 1-dimensional number string will be used as input and the result of the operation in the option will be returned. Write this application using the Python programming language.

Note: It is forbidden to use ready-made functions max, min, mean, sum, abs or ready-made functions from another library in writing functions.

Note: Explanation lines should be added for the codes you have written in each question.