package test;

public class Solution {

private String Reverse(String s){

char[] arr = s.toCharArray();

int i = 0;

int j = arr.length - 1;

while(i < j){

char c = arr[i];

arr[i] = arr[j];

arr[j] = c;

i++;

j--;

}

return new String(arr);

}

public String ReverseSentence(String str) {

if(str.length() == 0) return str;

if(str.equals(" ")) return str;

str = Reverse(str);

String[] arr = str.split(" ");

for(int i=0; i<arr.length; i++){

arr[i] = Reverse(arr[i]);

}

String ans = arr[0];

for(int i=1; i<arr.length; i++){

ans += " " + arr[i];

}

return ans;

}

public static void main(String[] args) {

Solution s1 = new Solution();

System.out.println(s1.ReverseSentence(" "));

}

}