04. Applied Arithmetics

package Uprajnenie;

import java.util.Arrays;
import java.util.List;
import java.util.Scanner;
import java.util.stream.Collectors;

public class AppliedArithmetics {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);


        String input = scanner.nextLine();

        List<Integer> numbers = Arrays.stream(input.split("\\s+"))
                .map(Integer::parseInt)
                .collect(Collectors.toList());

        String command;
        while (!(command = scanner.nextLine()).equals("end")) {
            switch (command) {
                case "add":
                    numbers = numbers.stream().map(num -> num + 1).collect(Collectors.toList());
                    break;
                case "multiply":
                    numbers = numbers.stream().map(num -> num * 2).collect(Collectors.toList());
                    break;
                case "subtract":
                    numbers = numbers.stream().map(num -> num - 1).collect(Collectors.toList());
                    break;
                case "print":
                    System.out.println(numbers.stream().map(String::valueOf).collect(Collectors.joining(" ")));
                    break;
            }
        }
    }
}