using System;
using System.Numerics;
using System.Globalization;
public class Class1
{
public static void Main()
{
NumberFormatInfo fmt = new NumberFormatInfo();
fmt.NegativeSign = "~";
BigInteger number = BigInteger.Parse("~9999999999999", fmt);
Console.WriteLine(number.ToString(fmt));
Console.WriteLine(number);
}
}