题解 | #简写单词#

using System;

class Program {
    static void Main(string[] args) {
        string input = Console.ReadLine();

        Console.WriteLine("" + Abbreviate(input));
    }

    static string Abbreviate(string input) {
        string[] words = input.Split(' ');
        string abbreviation = "";
        foreach (string word in words) {
            if (!string.IsNullOrWhiteSpace(word)) {
                abbreviation += char.ToUpper(word[0]);
            }
        }
        return abbreviation;
    }
}