using System;

using System.Text;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        string input = "ad4aa";

bool isDigitPresent = input.All(char.IsDigit);

        if (isDigitPresent) {

            Console.WriteLine("Given string is numeric");

        }

        else {

            Console.WriteLine("Given string is non-numeric");

        }

    }

}