Help with java program crashing when certain boolean types are entered

[Gruntlet01]

Hi all, I am a new A level computer science student and am currently struggling with a piece of code that I have written. That code is as follows:

import java.util.Scanner;
public class Question5{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        Boolean cont = true;
        String actanswer = "RANDOM";
        System.out.println("I am thinking of a 6 letter word. Start guessing!");
        while(cont == true){
            System.out.println("Please enter your guess:    ");
            String crntguesslower = sc.nextLine();
            String crntguess = crntguesslower.toUpperCase();
            String[] parts = crntguess.split("");
            String part1 = parts[0];
            String part2 = parts[1];
            String part3 = parts[2];
            String part4 = parts[3];
            String part5 = parts[4];
            String part6 = parts[5];

            char letter1 = 'a';
            char letter2 = 'b';
            char letter3 = 'c';
            char letter4 = 'd';
            char letter5 = 'e';
            char letter6 = 'f';

            switch (part1){
                case "R": letter1 = 'R';
                break;
                default: letter1 = '?';
            }
            switch (part2){
                case "A": letter2 = 'A';
                break;
                default: letter2 = '?';
            }
            switch (part3){
                case "N": letter3 = 'N';
                break;
                default: letter3 = '?';
            }
            switch (part4){
                case "D": letter4 = 'D';
                break;
                default: letter4 = '?';
            }
            switch (part5){
                case "O": letter5 = 'O';
                break;
                default: letter5 = '?';
            }
            switch (part6){
                case "M": letter6 = 'M';
                break;
                default: letter6 = '?';
            }
            System.out.println("Result: " + letter1 + letter2 + letter3 + letter4 + letter5 + letter6);
            String answercheck = crntguess;
            switch(answercheck){
                case "RANDOM": System.out.println("Congratulations, you have guessed correctly! Would you like to continue? True/False");
                break;
                default: System.out.println("Sorry, you have not yet guessed correctly, would you like to try again? True/False");

            }
            cont = sc.nextBoolean();
        }
    }
}

My issue is that every time the user types 'True' to continue and guess again, the program crashes with the error:

java.lang.ArrayIndexOutOfBoundsException: 1
at Question5.main(Question5.java:14)

Any help at all with fixing this would be greatly appreciated.