how do you display nothing
package com.codegym.task.task04.task0427;
/*
Describing numbers
*/
import java.io.*;
import java.util.*;
public class Solution {
public static void main(String[] args) throws Exception {
Scanner s1 = new Scanner(System.in);
int a;
a = s1.nextInt();
if( a < 10 && a >= 1 && a % 2==0 ){
System.out.println("even single-digit number");
}
else if(a < 10 && a % 2 !=0 ){
System.out.println("odd single-digit number");
}
else if(a < 100 && a>=10 && a % 2==0){
System.out.println( "even two-digit number" );
}
else if(a < 100 && a>=10 && a % 2!=0){
System.out.println( "odd two-digit number" );
}
else if(a < 1000 && a>=100 && a % 2==0){
System.out.println( "even three-digit number" );
}
else if(a < 1000 && a>=100 && a % 2!=0){
System.out.println( "odd three-digit number" );
}
else{
System.out.println( "" );
}
}
}