题解 | #数字颠倒#

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;

public class Main{
    public static void main(String[] args) throws IOException{
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        String str = reader.readLine();
        int num = Integer.parseInt(str);
        if(num == 0) System.out.println(0);
        while(num != 0){
            System.out.print(num%10);
            num /= 10;
        }
    }
}