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

namespace ConsoleApplication3
{
    class Program
    {
        static void Main(string[] args)
        {
            int a, b;
            Boolean flag;
          input:
            Console.WriteLine("请输入数A：");
            a = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("请输入数B：");
            b = Convert.ToInt32(Console.ReadLine());
            if (a > b)
            {
                Console.WriteLine("A>B");
                flag = true;

            }
            else
            {
                Console.WriteLine("A<B");
                flag = false;
            }
        }
    if (flag == false)
        {
        goto input;
        }
        }
    }
}这后面编译不通过，怎么错误啊，求解释