Problem:
Reverse Sequence

Write a program which reverses a given string str.

Input

str (the size of str ≤ 20) is given in a line.

Output

Print the reversed str in a line.

Sample Input

w32nimda

Output for the Sample Input

admin23w

Solution in C# (judge verdict: Wrong Answer)

using System;

namespace ReverseString
{
    class Program
    {
        static void Main(string[] args)
        {
            string inputString, outputString = "";
            int length;
            Console.Write("Enter a string : ");
            inputString = Console.ReadLine();
            length = inputString.Length - 1;

            if (20 <= length)
            {
                Console.WriteLine("Please enter a string having size 20 or less");
                Console.ReadLine();
            }
            else
            {
                while (0 <= length)
                {
                    outputString = outputString + inputString[length];
                    length--;

                }
                Console.WriteLine("Reverse  string  is  {0}", outputString);
                Console.ReadLine();
            }
        }
    }
}