【洛谷OJ】1307 数字反转

import java.util.Scanner;

public class Main{
    private static Scanner cin;
    
    public static void main(String args[])throws Exception {
        cin = new Scanner(System.in);
        int number = cin.nextInt();
        StringBuilder sb = new StringBuilder(String.valueOf(Math.abs(number)));
        int ret = Integer.valueOf(sb.reverse().toString())*(number/Math.abs(number));
        System.out.println(ret);
    }
}