string s = textBox1.Text;
            s = s.Replace(" ", "");
            char[] letters = s.ToArray();
            foreach(char r in letters) {
                string o = r.ToString();
                string w;
                int tempnum;
                bool isNumber = int.TryParse(o, out tempnum);
                if(isNumber) {
                    w = "Number(" + tempnum + "),";
                } else {
                    w = "BinOP(" + o + "),";
                }
                textBox2.Text += w;
            }