import java.util.Scanner;

public class Solution {
	
	public String ReverseSentence(String str) {
		if(str.equals(" ")||str==null){
			return " ";
		}
        String[] split = str.split(" ");
        int len=split.length;
        StringBuffer sb=new StringBuffer();
        for (int i = len-1; i >=0 ; i--) {
        	if(i!=0){
        		sb.append(split[i]+" ");
        	}else{
        		sb.append(split[i]);
        	}
		}
		return sb.toString();
	}
}