题解 | #字符串反转#

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while (sc.hasNext()) {
            String a = sc.nextLine();
            StringBuilder sb = new StringBuilder();
            for (int i = a.length(); i > 0; i--) {
                sb.append(a.substring(i -1,i));
            }
            System.out.println(sb);
        }
    }
}