题解 | #字符串反转#

import java.util.Scanner;
import java.lang.StringBuilder;
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        while (in.hasNextLine()) { 
            System.out.println(myAns(in.nextLine()));
        }
    }
    
    private static String myAns(String str) {
        str = str.toLowerCase();
        StringBuilder sb = new StringBuilder(str.length());
        for (int i = str.length() - 1; i >= 0; i--) {
            sb.append(str.charAt(i));
        }
        return sb.toString();
    }
}