题解 | 简写单词 c#

using System;
using System.Linq;
public class Program {
    public static void Main() {
            //一行Linq查询搞定
            var output = Console.ReadLine().Split(" ").Select(word => word[0].ToString().ToUpper());
            
            foreach (var item in output)
            {
                Console.Write(item);
            }

    }
}