Subtraction

static void Main(string[] args)
        {
            StreamReader sr = new System.IO.StreamReader("G:\\subtraction.txt");
            char[] str = new char[400];
            sr.Read(str, 0, 400);
            var number1 = new List<char>();
            var number2 = new List<char>();
            
            int position1 = (str.ToString()).IndexOf("\r\n");
            for(int i=0; i<position1; i++)
            {
                number1.Add(str[i]);
            }
            for (int i = position1+1; i < str.Length; i++)
            {
                number2.Add(str[i]);
            }
            foreach (var k in number1)
            { Console.Write(k); }
            Console.WriteLine();
            foreach (var f in number2)
            { Console.Write(f); }
            Console.ReadLine();
        }

Subtraction1

42353253262393205238593580932523898050928432435253252352352353252352
3258239052395832905092359823958239859082343225325