static string On(string s)
        {
            //var c = ":-)";

            int smilestage = 0;
            var smiletype = ')';
            StringBuilder result = new StringBuilder();
            for (int i = 0; i < s.Length; i++)
            {
                switch (smilestage)
                {
                    case 0:
                        if (s[i] == ':') smilestage++;
                        result.Append(s[i]);
                        break;
                    case 1:
                        if (s[i] == '-') smilestage++;
                        else smilestage = 0;
                        result.Append(s[i]);
                        break;
                    case 2:
                        if (s[i] == ')')
                        {
                            smiletype = ')';
                            smilestage++;
                        }
                        else if (s[i] == '(')
                        {
                            smiletype = '(';
                            smilestage++;
                        }
                        else
                        {
                            smilestage = 0;
                        }
                        result.Append(s[i]);
                        break;
                    case 3:
                        if (smiletype == ')' && s[i] == ')')
                        {

                        }
                        else if (smiletype == '(' && s[i] == '(')
                        {

                        }
                        else
                        {
                            result.Append(s[i]);
                            smilestage = 0;
                        }
                        break;
                }

            }