Anonymous Threat

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

public class test {
    public static void main (String[] args) {
        Scanner Scanner = new Scanner(System.in);
        List<String> strings = Arrays.stream(Scanner.nextLine().split(" ")).collect(Collectors.toList());

        String input = Scanner.nextLine();
        while (!input.equals("3:1")) {
            String[] inputArray = input.split(" ");
            switch (inputArray[0]) {
                case "merge":
                    // merge {startIndex} {endIndex}
                    StringBuilder mergedElements = new StringBuilder();
                    int endIndex;
                    if (Integer.parseInt(inputArray[2]) >= strings.size()) {
                        endIndex = strings.size();
                    } else {
                        endIndex = Integer.parseInt(inputArray[2]) + 1;
                    }
                    int startIndex;
                    if (Integer.parseInt(inputArray[1]) < 0) {
                        startIndex = 0;
                    } else if (Integer.parseInt(inputArray[1]) > strings.size() - 1){
                        startIndex = strings.size() - 1;
                    } else {
                        startIndex = Integer.parseInt(inputArray[1]);
                    }
                    for (int i = startIndex; i < endIndex; i++) {
                        mergedElements.append(strings.get(i));
                        strings.set(i, null);
                    }
                    int index = 0;
                    for (int j = 0; j < strings.size(); j++) {
                        if (strings.get(j) == null) {
                            index = j;
                            strings.remove(j);
                            j--;
                        }
                    }
                    strings.add(index, mergedElements.toString());
                    break;
                case "divide":
                    // divide {index} {partitions}
                    StringBuilder stringToDivide = new StringBuilder();
                    stringToDivide.append(strings.get(Integer.parseInt(inputArray[1])));
                    strings.remove(Integer.parseInt(inputArray[1]));
                    int partitionsLength;
                    if (stringToDivide.length() % Integer.parseInt(inputArray[2]) == 0) {
                        partitionsLength = stringToDivide.length() / Integer.parseInt(inputArray[2]);
                        if (partitionsLength  == 0) {
                            partitionsLength = 1;
                        }

                        int index1 = 0;
                        int indexToAdd = Integer.parseInt(inputArray[1]);
                        while (index1 < stringToDivide.length()) {
                            strings.add(indexToAdd, stringToDivide.substring(index1, Math.min(index1 + partitionsLength,stringToDivide.length())));
                            index1 += partitionsLength;
                            indexToAdd++;
                        }

                    } else {
                        char lastChar = stringToDivide.charAt(stringToDivide.length() - 1);
                        stringToDivide.deleteCharAt(stringToDivide.length() - 1);
                        partitionsLength = stringToDivide.length() / Integer.parseInt(inputArray[2]);

                        if (partitionsLength  == 0) {
                            partitionsLength = 1;
                        }

                        int index1 = 0;
                        int indexToAdd = Integer.parseInt(inputArray[1]);
                        while (index1 < stringToDivide.length()) {
                            if (index1 < stringToDivide.length() - partitionsLength) {
                                strings.add(indexToAdd, stringToDivide.substring(index1, Math.min(index1 + partitionsLength,stringToDivide.length())));
                                index1 += partitionsLength;
                                indexToAdd++;
                            } else {
                                strings.add(indexToAdd, stringToDivide.substring(index1, Math.min(index1 + partitionsLength,stringToDivide.length())) + lastChar);
                                index1 += partitionsLength;
                                indexToAdd++;
                            }
                        }

                    }
                    break;
                default:
                    System.out.println("unknown command");
                    break;
            }
            input = Scanner.nextLine();
        }
        for (int i = 0; i < strings.size(); i++) {
            System.out.print(strings.get(i));
            if (i != strings.size() - 1) {
                System.out.print(" ");
            } else {
                System.out.println("");
            }
        }
    }
}