字符串最后一个单词的长度

题目：牛客网 

import java.util.Scanner;

public class Main {
	
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner in = new Scanner(System.in);
		while(in.hasNext()){
			String str = in.nextLine();
			String[] arr = str.split(" ");
			System.out.println(arr[arr.length-1].length());
		}
	}

}