using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        IReadOnlyList<string> sample = new string[] {"6987646475767", "BC8385FB101F", "BC8385FB138F" };

// string[] sample = new string[] {BC8385FB104E, BC8385FB101F, BC8385FB138F };

string str = "6987646475767";

long res = long.Parse(str);

str = sample[0];

​

long l1 = long.Parse(str);

Console.WriteLine(l1);

foreach (var mac in sample)

{

//long.TryParse(mac, out l1);

//Console.WriteLine(long.Parse(mac));

}

    }

}