using A;

using B;

using System;

​

namespace A

{

    class C

    {

        public static void foo()

        {

            System.Console.WriteLine("A.C.foo");

        }

    }

}

​

namespace B

{

    class C

    {

        public static void foo()

        {

            System.Console.WriteLine("B.C.foo");

        }

    }

}

​

public class Program

{

    public static void Main()

    {

        C.foo();

    }

}