Barcode generator

import java.util.*;

public class BarcodeGenerator {
    public static void main(String[] args) {
        Scanner myScan = new Scanner(System.in);
        String firstNumber=myScan.nextLine();
        String secondNumber=myScan.nextLine();
        int iStart=Integer.parseInt(String.valueOf(firstNumber.charAt(0)));
        int iEnd=Integer.parseInt(String.valueOf(secondNumber.charAt(0)));
        int jStart=Integer.parseInt(String.valueOf(firstNumber.charAt(1)));
        int jEnd=Integer.parseInt(String.valueOf(secondNumber.charAt(1)));
        int kStart=Integer.parseInt(String.valueOf(firstNumber.charAt(2)));
        int kEnd=Integer.parseInt(String.valueOf(secondNumber.charAt(2)));
        int lStart=Integer.parseInt(String.valueOf(firstNumber.charAt(3)));
        int lEnd=Integer.parseInt(String.valueOf(secondNumber.charAt(3)));
        for (int i = iStart; i <=iEnd ; i++) {
            for (int j = jStart; j <=jEnd ; j++) {
                for (int k = kStart; k <=kEnd ; k++) {
                    for (int l = lStart; l <=lEnd ; l++) {
                        if (i%2!=0&&j%2!=0&&k%2!=0&&l%2!=0){
                            System.out.printf("%d%d%d%d ",i,j,k,l);
                        }
                    }
                }
            }
        }
    }
}