using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp1
{
    internal class Program
    {
        private static void Main(string[] args)
        {
            string n1, n2;
            string t;
            NhapTiep:
            Console.WriteLine("Tro Choi Keo Bua Bao");
            Console.WriteLine("++++++++++++++++");
            Console.WriteLine("Yeu cau nhap mot trong ba: B (bua), K (keo), O (bao)");

            n1 = NhapDuLieu(1);
            n2 = NhapDuLieu(2);

            // Xét dữ liệu
            switch (n1)
            {
                case "B" when (n2 == "K"):
                case "K" when (n2 == "O"):
                case "O" when (n2 == "B"):
                    Console.WriteLine("1 Thang 2");
                    break;

                case "B" when (n2 == "O"):
                case "K" when (n2 == "B"):
                case "O" when (n2 == "K"):

                    Console.WriteLine("1 Thua 2");
                    break;

                default:
                    Console.WriteLine("Hoa");
                    break;
            }

            Console.WriteLine($"Tiep tuc nhap '1': ");
            t = Console.ReadLine();
            switch (t)
            {
                case "1":
                    goto NhapTiep;
            }
            Console.ReadKey();
        }

        private static string NhapDuLieu(int p)
        {
            string n;
            Nhap:
            Console.WriteLine($"Moi nguoi thu {p} nhap:");
            n = Console.ReadLine();
            switch (n)
            {
                case "B":
                case "K":
                case "O":
                    break;

                default:
                    Console.WriteLine("Loi, vui long nhap dung yeu cau");
                    goto Nhap;
            }

            return n;
        }
    }
}