题解 | 简写单词

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);
        String s=in.nextLine().toUpperCase();
        String[] strarr=s.split(" ");
        StringBuilder sb= new StringBuilder();
        for(String words:strarr)
        {
            sb.append(words.charAt(0));
        }
        System.out.println(sb.toString());
    }
}