static void Main(string[] args)
{
string inputString;
do
{
Console.WriteLine("Enter a non-empty string");
inputString = Console.ReadLine();
} while (inputString.Length == 0);
SubstringOfEvenElements EvenIndexString = new SubstringOfEvenElements();
Console.WriteLine(EvenIndexString.CreateSubstringOfEvenElements(inputString));
}
