I guess that there must be something wrong in the test of system.

Execution time is just 0.14 (even less), and Memory used: 2 008 KB

My solution:

        static void Main(string[] args)
        {
            char[] chs = Console.In.ReadToEnd().TrimEnd().ToCharArray();
            string tmpStr="";
            foreach (char ch in chs)
            {
                if (char.IsLetter(ch))
                {
                    tmpStr = ch + tmpStr;
                }
                else
                {
                    Console.Write(tmpStr+ch);
                    tmpStr = "";
                }
            }
            if (tmpStr != "") Console.Write(tmpStr);
            Console.ReadLine();

        }

Edited by author 26.02.2013 06:18

Edited by author 26.02.2013 06:34