题解 | #单词倒排#

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        String str = "";
        while (sc.hasNextLine()){
            str = sc.nextLine();
            if(str.equals("\n")){
            }else{
                break;
            }
        }

        StringBuilder sb = new StringBuilder();
        for(int i = 0 ; i< str.length(); i++){
            char c = str.charAt(i);
            if(c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z'){
                sb.append(c);
            }else {
                sb.append(" ");
            }
        }
        str = sb.toString();
        String[] arr = str.split(" ");
        for(int i = arr.length - 1; i >= 0 ; i--){
            if(!" ".equals(arr[i]) && !"".equals(arr[i]) )
                System.out.print(arr[i] + " ");
        }
    }
}