题解 | #字符串最后一个单词的长度#

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 in = new Scanner(System.in);
        while (in.hasNextLine()) {
            String a = in.nextLine();
            int index = -1;
            for (int i = 0; i < a.length(); i++) {
                if (a.charAt(i) == ' ') {
                    index = i;
                }
            }
            System.out.println(a.length() - index - 1);
        }
    }
}